Which of the following is bit addressable register


HTTP/1.1 200 OK Date: Fri, 23 Jul 2021 15:00:41 GMT Server: Apache/2.4.6 (CentOS) PHP/5.4.16 X-Powered-By: PHP/5.4.16 Connection: close Transfer-Encoding: chunked Content-Type: text/html; charset=UTF-8 203b o Destination address 1. Register are used to quickly accept, store, and transfer data and instructions that are being used immediately by the CPU, there are various types of Registers those are used for various purpose. The two simplest branch instructions are: BCR Branch on Condition Register. Ans: The offset of the CS Register is the IP register. 8 bit C. e. Answer. 7 6 5 4 3 2 1 0 Function IE U U SI TF1 Ex1 TF0 Ex0 Bit Addr AF AE AD AC AB AA A9 A8 Bit Name EA - - ES ET1 EX1 ET0 EX0 The most significant bit of the register is a global interrupt enable flag. Doubles b. Show how the following values would be stored by byte-addressable machines with 32-bit words, using little endian and then big endian format. 3. CPSR fields are divided in to four fields, each 8-bit wide: flags, status, extension, and . true. Not all the address space of 80 to FF are used by special function registers. In the bit-addressable RAM of 8051, among the byte addresses 88H and 89H . B. 8-bit register used to select timer mode. 2 juin 2021 . If it is not aligned, it can cross a 32-bit boundary and require additional memory fetches. A mask is a binary 4-bit value expressed often in the form B'bbbb' with 4 bits b. So in order to write an ISR for INT0, you have to keep in mind the following things:- 1) Place the ISR for INT0 beginning from its vector address – 0003H. 42) What is the bit addressing range of addressable individual bits over&n. The flags which generate these type of interrupts are bits IE0 and IE1. Select which instruction is not used for operation on a single bit. Which of the following register is used to hold address of the next instruction to be executed? Program counter. 32 bit ANSWER: C 57. TH0/TL0 ->Timer 0 16 bit register (byte addressable only) 8 bits can be . 26. For this problem, you may assume that its ISA allows the following operations: Microcontrollers use the concept of a direction register to determine whether a pin is an input (direction register bit is 0) or an output (direction register bit is 1), as shown in Figure 6. Multiply the contents of number register %esi by 4 and add the result to the contents of number register %ebx to 1. The program counter in 8085 microprocessor is a 16-bit register, because. that bit must belong to the group of the so called bit addressable registers. _________destination inverts each bit of destination. This form of the call instruction copies that value directly into the CS:IP register pair. 237) The capture operation in counter mode is feasible when mode of CCP module is _____ a. Operations require the following: . With 20 bit addresses, the address bus will need to be 20 bits wide and the MAR and PC will need to be 20 bits long. The accumulator holds the address of the next instruction to be executed. The MARIE Datapath 56. The control register that stores the 32-bit linear address, at which the previous page fault is detected is a) CR0 b) CR1 c) CR2 d) CR3 Answer: c Explanation: The control register, CR2, is used to store the 32-bit linear address, at which the previous page fault is detected. (a) PORTA (b) PORTB (c) R19 (d) Status Register (e) PC Register. , 8 cache lines) • Each cache row (line) holds 16 bytes of data 2) Suppose we want to put the 32-bit value 0x456789AB into register $4. Both are bit-addressable b. VAX Architecture divides 32-bit addresses into 4 equal sized sections, and each page is 512 bytes, yielding an address form of: With a 64-bit logical address space and 4K pages, there are 52 bits worth of page numbers, which is still too many even for two-level paging. 8) Which among the below mentioned devices of MCS-51 family does not possess . and. Move the contents of this address into number register %eax. Computer Architecture Objective type Questions and Answers. 84) Which of the following memories allows simultaneous read and write operations? a. A mask is a binary 4-bit value expressed often in the form B'bbbb' with 4 bits b. CS401 Computer Architecture and Assembly Language Online Solved Quizzes/MCQ's File No 3. To select one of these two registers, a multiplexor is needed. In many respects, this is equivalent to the immediate addressing mode since the value this instruction copies into the CS:IP register pair immediately follows the instruction. 7. Here is the code in a single block: BSF 03h,5 ;Go to Bank 1. . None of these 100) Which bus plays a crucial role in I/O: a. In the Indirect Addressing mode, a register is used to hold the effective address of the operand. Some CPUs [20] permit the 8-bit indirect address to use any 8-bit general purpose register. a. The 8-bit address bus allows access to an address range of a) 0000 to FFFFH b) 000 to FFFH c) 00 to FFH d) 0 to FH. Therefore register bank 3 is initiated. Remains unchanged c. This section contains more frequently asked Microprocessor 8086 and Microcontroller Multiple Choice Questions and Answers which are randomly compiled from various reference books and Questions papers for those who are preparing for the various University Level and Competitive Examinations. If RS0 = 1 and RS1 = 0, the register bank address range is . 9 mars 2021 . MOV R1, 30H c. This is a bit addressable register in which EA value must be set to one for enabling . This allows the chip to have only 11 address pins, with two extra control (RAS and CAS – 14 total) rather than 22 address pins with an additional select (23 total). . Thus a CPU with 16 processor registers R0 through R15 will have a register address field of four bits. e. In this example, 8-bit values (10, -1, abc, and a) are placed into consecutive bytes in memory with . . 2. The TMOD register is a(n) 7. This is not bit . Thus it will have 22 address lines (since 4M = 222), an 8-bit data output line, and an 8-bit single data input line. The status bit is also called (A) Binary bit (B) Flag bit (C) Signed bit (D) Unsigned bit. The second is that there is much stricter address space accounting code in place. QUESTION: 4 The higher and lower bytes of a 16-bit register DPTR are represented respectively as Register B is also byte addressable and bit addressable. The detailed map of various registers is shown in the following . What is the purpose of the IP/EIP register? 7. Although any data can be moved between any of . These are located at addresses 85h and 86h respectively. of 11-bit address. . The I bit is 0 and the address part of the instruction has the binary equivalent of 135. If MN/MX’ is low, 8086 is in Maximum Mode. IP(Interrupt Priority register), Bit addressable. services the level of production that. Register File The interface should minimally include: - an n-bit input to import data for writing (a write port) - an n-bit output to export read data (a read port) The program status word [PSW] is an 8-bit register. movl (%ebx, %esi, 4), %eax. There are 16 address times. Save A’s return address (in $31) on stack 2. a) An 8 bit register in the microprocessor. 3 A SETB PSW. The BIT directive is used to replace a bit address by a symbol. The two banks receive as address the binary configuration 0. . According to the memory map, MuP21 addresses directly only 256 KB of SRAM memory. → 1777 c. would cause leftward shift in supply. Will an overflow occur if a signed FFH is added to a . 8-bit auto reload 4. NOT; NOR . . It is also used to select . Registers in Computer Architecture. In branching mechanism, the assembler. The address of the byte fetched is the sum of the original unsigned 8-bit Accumulator contents and the contents of a 16-bit base register, which may be either the Data Pointer or the PC. The difference is that these are performed upon single bits. 16 BIT . d) 16 and 20. The accumulator holds data ONLY. Even though these microcontrollers had quite modest features in comparison to the . ANS : C. This form of the call instruction copies that value directly into the CS:IP register pair. In Big-Endian systems the most significant byte of a multi-byte data item has the lowest address, while the least significant byte has the highest address. As can be seen in figure 4. 207d These are bits 0-7 of the register. 18H-1FH Answer: c. It is also possible to shift the data from right to left by following the same procedure. , the total memory size is 216 = 65536 bytes) • The cache has 8 rows (i. TRISA. below type; far type . 25 août 2020 . Some of the basic timer registers are TMOD, TCON, THx and TLx. 10) Which general purpose register holds eight bit divisor and store the . It was the first 16-bit processor having 16-bit ALU, 16-bit registers, internal . 2. View Answer. 2013 . The register bank is also called as R3. Check the appropriate answer of the following: a. e. First register contains bits 15 – 0 of 32-bit number (bits 15 – 0 of significand) Second register contains bits 31 – 16 of 32-bit number (exponent and bits 23 – 16 of significand) 984 Single precision unsigned decimal. where the instruction is sent from memory to the instruction register . Definition. . PRINTED NEXT . 16-bit CPU with 21-bit or larger (typically 31-bit or 32-bit) total byte-addressable memory with the 1M just being a small portion of the potential addressable memory for that particular CPU. The following sections describe these additional data types. In a system with a 16 bit address bus, what is the maximum number of 1K byte memory devices it could contain A. We want to allow MARIE to have 4 addressing modes, direct, indirect, immediate and indexed (where the memory address is a combination of the address in the instruction and the value stored Syntax: SETB [bit address]; Bytes: 2 (instruction code, bit address); STATUS register flags: No flags affected; EXAMPLE: Before execution: P0. Which of the following is the language used in making an internet web page? . Address bus _____ containing the address of the next instruction to be executed. Searching for :The following is not a test typesDate:2021-07-08 17:37:17Done by:Anonymous user(Visitor) (Associativity doesn't affect the set bits as they just adds extra slots in each set). Score: 0 Accepted Answers: What is the result after execution of SETB P 1. To access bit o or to access all 8 bits (as a single byte), physical address F0 is used. Microprocessor Set 6 (30 mcqs) 1. In the video, Professor Bierman explains the older Intel architecture that had a 16 bit segment register and a 16 bit address register. The data would be retrieved from the register. The extended registers are addressable by which microprocessors? 4. ADDRESS BUS (External) 16 bit I-RAM General Registers STACK Bit-addressable SFRs etc. d. 3. Pseudodirect addressing: 26 bits of the address is embedded as the immediate, and is used as the instruction offset within the current 256MB (64MWord) region defined by the MS 4 bits of the PC. 16 bytes. 18 - Address translation for a two-level 32-bit paging architecture. By default, this will be a NULL operation. The real confusion here is confusing two questions: 1. In the Indirect Addressing mode, a register is used to hold the effective address of the operand. Q11. The maximum count value of 16-bit count register puts a limitation on a) memory usage b) storage of address of registers c) to generate clock pulse d) to generate maximum delay Answer: d Explanation: The maximum count value of 16-bit count register is FFFFH. 4. The two numbers that follow are the address of the register, in this case the STATUS register, and the bit number, in this case bit 5. Introduction to caches: For a direct-mapped cache design with a 32-bit address and byte-addressable memory, the following bits of the address are used to access the cache: Tag Index Offset a. ROM. A. This value is called address size, the smallest unit addressable . Now we can clearly state the difference between Byte Addressable Memory & Word Addressable Memory. (1) it is a 16 bit register. Which of the following pins is the external data memory write strobe in 8051? a) P3. c. TH1/TL1-> Timer 1 16 bit register (byte addressable only) 8 bits can be send at a time. An SRAM chip has a specifi c confi guration in terms of the number of addressable locations, as well as the width of each addressable location. For instance, the cell C ij is the cell for bit j in word i. Which register bank is used if we use the following instructions. The first step is to set PCADC followed by PDN in ADC0CR. Formulate fetching and executing instructions? I will add a flip flop (P) that would do the following: Question 5-18) a. Note: Bit addressable locations are given below . PCON: Power Control Register (Not Bit Addressable). plus distance between the byte and the segment start. Instruction Register(IR) memory address register (MAR) memory Buffer Register(MBR) (Page 350) Program counter (PC) o Address fields · See Figure 7. Processors with 32-bit address buses can access 2 32 = 4,294,967,296 = 4G of memory. is byte addressable and its data bus is 8-bit wide. EAX is referenced as a 32-bit register (EAX), as a 16-bit register (AX), or as either of two 8-bit registers (AH and AL). address B. These flags are used to select bank of register by resetting those flags which are as shown in . . divided into four banks of register. IAS Computer IAS computer is the upgraded version of the ENIAC machine. What register keeps track of interrupt priority in the 8051? 20 avr. Q2) Calculate the effective address for the following . At the end of the fourth clock pulse, the inserted data bit ‘1’ will be received at the output terminal D OUT. Which of the following is not a feature of 8051? Option A: 1KB internal RAM Option B: 4KB internal ROM Option C: 8 bit data Option D: 16 bit address Q5. See full list on elprocus. A 16-bit 8086 microprocessor was the first of CPU architectures. 8 déc. • Memory is byte addressable • Memory addresses are 16 bits (i. For example : The physical address of the next instruction to be fetched is formed by combining the current contents of the code segment CS register and the current contents of the instruction pointer IP register. TIFRO is a bit-addressable register Cind the TCCRUA and TCCROB values for . STATUS Register. EPROM. Timer1 is used for generating the baud rate. d. This bit A 32 bit segmented address immediately follows the call opcode. TCON register is a bit addressable register. Setting this bit activates Idle Mode operation in the 8051BH. Operands residing in processor registers are specified with a register address. Note: If the MARIE has a 12–bit address space, the MAR is a 12–bit register. In addition to these 32 general-purpose registers, the CPU has a few . PSW Register (all 8051 and 251 variants) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 CY AC FO RS1 RS0 OV UD P Additional PSW1 Register (on 251 Architecture only) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 CY AC N RS1 RS0 OV Z — The following table describes the status bits in the PSW: RS1 RS0 Working Register Bank and Address 0 0 . The bit mask shown in the expanded form of the Babel Buster RTU read map is a 4 digit hexadecimal (16 bit) value used to mask out one or more bits in a register. The cells present inside the memory array are marked by the letter C with two subscripts. . 31-10 9-5 4-0 b. The Ping packets needed to be fragmented, but the packets have their DF bit set (which says they cannot be fragmented). d. The instruction pointer is the address of the instruction being executed. 16 B. Index: Any general purpose register (rax, rbx, &c) 1. • Data memory is a single-ported memory (a maximum of one read or one write per cycle, not both). Send 0xC0 ( I2C address of the CMPS03 with the R/W bit low (even address) 3. It has 16-bit data bus. The BSA instruction is assumed to be in memory at address 20. The test carries questions on topics such as OPTION & INTCON Registers in Data Memory, Addressing Modes & I/O Ports, Interrupts in PIC 16C61 / 71, External Interrupts in PIC 16C61 / 71, Timer 0 & ADC Interrupts in PIC 16C61 / 71, Timer 0 & Watchdog Timer in PIC 16C61/71 Timers, ADC in PIC 16C71, Capture/ Compare/ PWM (CCP) Modules in PIC . The sequencing logic unit loads a new address into the control address register based on the next-address information from the control buffer register and the ALU flags. 20c1 This register plays a vital role to configure PORTA as an input or output. ANL C . In 2016, in most cases a byte will be eight bit. A stack is-. <a title="8085 Microprocessor MCQ" class . . That resources are fully employed in. Only 88H is bit-addressable c. 2B word-addressable memory would let you address 128kiB of memory, instead of just 64kiB with byte-addressable memory. three ANSWER: B 58. The Intel 8085 is an 8-bit microprocessor. [DL240]HR1024. Conditonion code flags in CPSR: N - Negative or less than flag Z - Zero flag C - Carry or bowrrow or extendedflag V - Overflow flag The least-significant 8-bit of the CPSR are the control bits of the system. Offset is sign-extended before adding to base register. 3 0. MOV A, #24H b. Registers R0 to R12 are general purpose registers, R13 is stack pointer (SP), R14 is subroutine link register and R15 is program counter (PC). Microcontroller  . These two registers TH and TL are timer high byte and timer low byte, . R15 contains the program counter and is accessible by the programmer. Which of the following memories in a computer is volatile? A. You may declare these variables as shown below: int bdata ibase; /* Bit-addressable int */ char bdata bary [4]; /* Bit-addressable array */ The variables ibase and bary are bit-addressable. You have to select the right answer to a question. 1. The bit addressable SFRs are like below -. IO5 is a 5-bit I/O address covering the bit-addressable part of the I/O address space, i. timer od used by the timer if the crystal attached to the AVR has the following . The value in the register is an operand instead of being a memory address to an operand. 3. 2016 . II. 4. If the 20-bit physical address is 56200H and the contents of code segment register is 5500H, then the contents of instruction pointer in 8086 would be. Base: Contents of base register, BX or BP. When a sub routine is called, the address of instruction following the CALL instruction is stored in/on the The 16-bit address requires the programmer to load the 16-bit index register. 3,L1 64) Which register is suitable for the corresponding count, if the measurement of pulse width is less than 65,535 μs along with the frequency of 4 MHz? a. So only Timer0 is available for timer or counter operations. 29) Which of the following statements will add the accumulator and register 3? Out of these 21 locations, 11are bit-addressable SFR locations. Q9. 86) A 32 bit microprocessor has the word length equal to. b. DPTR and the program counter (PC) are ___ bit registers. Q11. two D. Consider a hypothetical processor with an instruction of type LW R1, 20 (R2), which during execution reads a 32-bit word from memory and stores it in a 32-bit register R1. 4-bit register b. It could be 8 bit, or 9 bit, or 16 bit, anything. 4. DAA (a) 7AH (b) 80H (c) 50H (d) 22H. Small amounts of data (say 4 bytes, for example) fit nicely in a 32-bit word if it is 4-byte aligned. That's why these registers called as a Special Function Registers. Consider a machine with 64 MB physical memory and a 32-bit virtual address space. Answer: d. 7. A type of addressing mode, the offset address of the operand is given by the sum of contents of the BX/BP registers and 8-bit/16-bit displacement. Indicate which of the following registers are bit-addressable. Program status word is also referred to as the flag register. The size of these registers is 16 bits because the memory addresses are . W are sign-extended to 32 bits before being added to the contents of A n . byte. In the latter case, the PC is incremented to the address of the following instruction before being added with the Accumulator; otherwise the base register is . the lower half (range: 0–31) IO6 is a 6-bit I/O address covering the full I/O address space (range: 0–63) D16 is a 16-bit data address covering 64 KiB; in parts with more than 64 KiB data space, the contents of the RAMPD segment register is prepended 8-bit 16-bit 24-bit 32-bit. In many respects, this is equivalent to the immediate addressing mode since the value this instruction copies into the CS:IP register pair immediately follows the instruction. The Microprocessor places 16-bit address on the add lines from that address by _____ the register should be selected A. BC Branch on Condition. If the paging unit is disabled, then the linear address is used as Assume we want to set bit 4 and clear bit 2 (set bit 4 to a 1 and bit 2 to a 0) in an 8-bit control register mapped to memory location 0x0008 simultaneously (in the control register) and without affecting the state of the other bits in that memory location. Consider a hypothetical processor with an instruction of type LW R 1, 20(R 2), which during execution reads a 32-bit word from memory and stores it in a 32-bit register R 1. The physical location of the data in memory is carried by the address bus. The diagram shows four different paths from which the control address register (CAR) receives the address. addiu $4, $0, 0x4567 srl $4, $4, 8 addiu $4, $4, 0x89AB C. The B register is also commonly used by programmers as an auxiliary register to temporarily store values. 1 = 34h (00110100) pin 1 is configured as an output After execution: P0. 17. Then it copies bit 7 to bits 8-31 of the register (all bits to the left of bit 7). b) power down mode. The Interrupt Enable register has following bits to enable/disable the hardware interrupts of the 8051 controller. Answer: c. are executable. 00H-1FH. BC Branch on Condition. The _____ is w -bit wide and contains a data word, directly connected to the data bus which is b-bit wide memory address register (MAR) . 4 Register bank select control bits 1 & RS0 PSW. This is part two of the ARM Assembly Basics tutorial series, covering data types and registers. As electronics cannot “understand” what for example an instruction “if the push button is pressed- turn the light on” means, then a certain number of simpler and . The carry bit also has a direct address, since it resides in the PSW register, which is bit-addressable. a . . It is a 16-bit register used to store the memory address location of the next instruction to be . —rt is a source register for branches, but a destination register for the other I-type instructions. Accumulator and flag register 2. 80 bytes. - The sum of the base register and offset does not point at the operand address but to the address of memory location where the operand address can be found (address of address) 6. B (B Register, Addresses F0h, Bit-Addressable): The "B" register is used in two . 2. —It can range from -32,768 to +32,767. The address is a 16-bit signed two’s-complement value. To access bit 1 you may use F1 and so on. g. The binary number 0101, for example, will designate register R5. 1 16-bit Offset Indirect Indexed Addressing - Syntax of the addressing mode is [n,r] - n is 16 bit offset - r is base register X, Y, SP, PC the contents of an Address register, a Status register, the Temporary register or a Word Count register to the CPU. three ANSWER: B 58. 3. Now look at an example: The following table shows some of the opcodes used by MIPS. • byte addressing is used, little endian (where address of 64-bit word refers to address of ‘little' or rightmost byte, [containing bit 0 of word]) so sequential double word accesses differ by 8 e. Bit-address. It executes “strap loader” microprogram which is sequence of microinstructions stored in ROM. Which of the following instructions will move the contents of register 3 to the . a. To express a 20-bit address, two 16-bit registers are used: segment address in one 16-bit register, and the offset address in another 16-bit register. 2012 . ;16-bit address, such as ;1234H. Therefore, the individual bits of these variables may be directly accessed and modified. These external interrupts can be level triggered or edge triggered. An n-bit register has a group of n flip-flops and is capable of storing binary information of n-bits. 4. 8-bit register c. The SFR address of the register PSW is 0E0H The SFR TMOD is a bit-addressable one The SFR P2 corresponds to the Port 3 of the microcontroller The SFR instruction MOV P1, A is same as MOV 90H, A No, the answer is incorrect. 2088 14 nov. A 1 in bit 0 of the register field will cause R0 to be transferred, a 0 will cause it not to be transferred; similarly bit 1 controls the transfer of R1, and so on. irrespective of synchronization. Control bus c. Many instructions alter the flags to describe the result of the instruction. (ii) 16 bytes of bit addressable area and. The LES copies to words from memory to register and ______. SFR's (BOTH BYTE AND BIT ADDRESSABLE REGISTERS). c) idle mode. The router is attempting to load balance across two links, and one of the links is not working. 9 nov. These addresses are above 80H, as the addresses from 00 to 7FH are the addresses of RAM memory inside the 8051. Since it has 1 bit to enable or disable a channel, there is only 1 register needed, and the master merely writes the register data after the slave address, skipping the register number. c: The PC must be at least 24 bits. Statement A sets 3rd bit of flag register. • The bit . 7 ;Transmit bit (the seventh bit in PSW register) ;is assigned the name "TRANSMIT" OUTPUT BIT 6 ;Bit at address 06 is assigned the name "OUTPUT" RELAY BIT 81 ;Bit at address 81 (Port 0)is assigned the . The following table shows all the possible Mnemonics of the Logical Instructions. • Byte addressable machine is almost universal - Successive addresses refer to successive byte locations - There are two different schemes for addressing byte: big-endian little – endian - Also bit can be numbered the other way around: bit 0 is the MSB 02 4 0 8. None is bit-addressable If RS0 = 0 and RS1 = 1, the register bank address range is 00H-07H 08H-0FH 10H-17H 18H-1FH No, the answer is incorrect. In many respects, this is equivalent to the immediate addressing mode since the value this instruction copies into the CS:IP register pair immediately follows the instruction. 16 bit D. Paul Bone — Sep 5, 2018. 8 bit C. If RS0 = 0 and RS1 = 1, the register bank address range is a. 1 and 5. All internal registers such as general purpose and special function, are of 32-bit. It stores the offset address of the source. The control register that is used as page directory physical base . store 0100 0001 in AL. The Microprocessor places 16-bit address on the add lines from that address by _____ the register should be selected A. Four of the flags are called conditional flags, meaning that they indicate some conditions that result after an . Which of the following is bit-addressable register? a) SBUF b) PCON c) TMOD d) SCON View Answer Answer: d Explanation: The registers, accumulator, PSW, B, P0, P1, P2, P3, IP, IE, TCON and SCON are all bit-addressable registers. D and E register 4. These various ways of accessing data are called ___. Send the stop sequence. The next byte carries the least significant 8 bits of the 11-bit address. These bits may be used in future microcontrollers to invoke new features. A 32 bit segmented address immediately follows the call opcode. Answer: (a) By operating system. char. 1. There are 4 modes in which timer can be loaded. The following table specifies the assembly-language names for the lower portions of 64-bit registers. 5 (18 points) (a) (6 points) You are required to design a 2-bit synchronous counter by using a finite state machine. The effective address of the memory location is obtained by the addition of constant 20 and the contents of register R2. Complete the following problems in the exercises section at the end of Chapter 4. _______ is the most important segment and it contains the actual assembly language instructions to be executed by the microprocessor. If the paging unit is enabled, then it converts linear address into (a) effective address (b) physical address (c) segment base address (d) none of the mentioned Answer : b 30. 5 juil. Replaces the target with its address. program counter is not accessible: b. The 16-bit registers are available with their extended size of 32 bits, by adding the registers with a prefix of a) X b) E c) 32 d) XX View Answer Answer: b Explanation: A 32 bit register, known as extended register, is represented by the register name with a prefix of E. Use RAM location 32H to hold your counter value instead of registers R0 – R7 . 30H-7FH. . 18 How are the bits of the register PSW affected if we select Bank2 of 8051? a) PSW. The BSA instruction performs the following numerical operation: M [135] <-- 21, PC <-- 135 + 1 = 136. The two unused bits are user-definable flags. Finds the Branch offset and replaces the Branch target with it. Setting the fifth bit of this register indicates the performance of bank1 while resetting it will address bank 0. . • to translate a virtual address to a physical address, the MMU: – checks whether the virtual address is larger than the limit in the limit register – if it is, the MMU raises an exception – otherwise, the MMU adds the base address (stored in the relocation register) • 32-bit can refer to the program that uses the 32-bit internal registers and large memory capacity. 4. RAM . Which port can only be used as an I/O port? Port 0 . For instruction 2: Contents of RY = [R3] + [R4] = 200 + 400 = 600 Problem No. IAS was designed by von Neuman and was designed with the concept of stored-program, which allowed the machine operator to store the program along with its input and output into some memory location, but in ENIAC the program had to be manually entered. 4-bit register b. Instruction Set of 8051 The process of writing program for the microcontroller mainly consists of giving instructions (commands) in the specific order in which they should be executed in order to carry out a specific task. Answer:B . Check all the statements below that are true. RS1 PSW. What about the rest of memory? Solution #2: Use a register to generate a full 16-bit address. lui $4, 0x4567 addi $4, $4, 0x89AB D. This Microcontroller Test contains around 25 questions of multiple choice with 4 options. 2 32 bytes, or 4 gigabytes (each memory location is one byte). Special function registers (Bit addressable registers). 85) Which of the following memories has the shortest access times? a. The effective address of the memory location is obtained by the addition of a constant 20 and the contents of register R 2 . The first byte of an absolute jump instruction consists of. Typically, a 32-bit microprocessor will have a 32-bit external address bus and a 32-bit program counter, unless on-chip segment registers are used that may work with a smaller program counter. TRIS REGISTER: TRIS is a data direction register. restricted bit-transfer operations are allowed: c. 5. Registers are located on the processor so information can be accessed very quickly. It provides timing and control signal to the microprocessor D. 83. 25000H. true. The maximum integer which can be stored on a 8 bit accumulator is A. 32 bit ANSWER: C 57. Computer Architecture Objective type Questions and Answers. 2. The bit address must be in the range of 0 to 255. Each LED corresponds on one bit in the 16-bit output value, and lights if the bit is a one. The carry flag mnemonic is "CY," which is defined as bit address 0D7H. Only registers R0, R1 and DPTR can be used as pointer registers. 10H-17H d. Which of the following is bit-addressable register? a) SBUF b) PCON c) TMOD d) SCON View Answer. Setting TRIS bit for corresponding port will let know the data direction (whether read or write) to microcontroller. C. 32-bit microprocessors operating in protected mode could address up to ______ of memory. If the bit is 0, the . The Intel 8085 requires a 16-bits. This is because CPUs are 32-bit or 64-bit word based. Which of the following registers are not bit addressable? SCON PCON A PSW. 27 mars 2007 . Which one of the following statements for Intel 8085 is correct? Program counter (PC) specifies the address of the instruction last executed PC specifies the address of the instruction being executed PC specifies the address of the instruction be executed PC specifies the number of instruction executed so far 42. The Serial port is used for serial communication in mode 1 and 3. e. Option A: MOV A, B Option B: SETB P1, 0 Option C: CLR A Option D: RLC A Q4. 2082 Address bus d. two D. IEEE has chosen FFFE as a reserved value which can only appear in EUI-64 generated from the an EUI-48 MAC address. 14 bits/address-part, where every two instructions are packed into one memory word. This results in a total address of 17 bit and allows accessing 128 kiB of RAM. To program a pin to be an output or an input, we simply send a 0 or a 1 to the relevant bit in the register. None of the above. The address therefore consists of following bits (MSB to LSB): Special function register (usually only 1 bit is used), ZH (8bit), ZL (8bit). (cont') Example 5-11 Find out to which by each of the following bit. Which of the following is not a component of paging unit? a . In the second type, the Data Pointer is used for generating 16-bit address. Although the PSW register is 8 bits wide, only 6 bits of it are used by the 8051. The instruction RET executes . Does not replace until the test condition is satisfied. Data Space in the Cell = 8 bits 3. 2. Score: 0 Accepted Answers: 08H-0FH Microprocessor-8086 MCQs Set-10A +AA -. For example we have 16 (32-bit) registers named from R0 to R15 in ARM mode (usr). • 32-bit can refer to FAT file system, FAT32 allows each disk to be divided into a larger number of clusters (allocation units); • 32-bit can refer to binary address. The . 2017 . The main advantages of register addressing mode are. I begun writing a different blog post, but found that some of the background info was making that post too long, so I’ve split it into this seperate post. To convert this 16-bit address into 20-bit, the BIU appends 0H to the LSB (by multiplying with 16) of the address. A register address is a binary number of k bits that defines one of '2 k ' registers in the CPU. This callback is called security_file_mmap() which looks up a security_ops struct for the relevant function. Write two different MIPS code fragments that will read a 64 bit number stored at address 128 in memory and place it in register R4. Eight bit . Magnetic bubble memory. The extended BX register is addressed as. DS; CS. 39. 10H . For instance: B'1101' B'0110' B'1111'. Bit addressable Registers The 8051 uses 8-bit data type. Which of the following is a 16-bit micro processor? (a) Motorola 6800 (b) Intel 8085 (c) Intel 8086 (d) Zilo 80. Base: Any general purpose register. (c) Memory Registers – There are two 16-bit registers used to hold memory addresses. Bit as well as byte addressable RAM area of 16 bytes. The special function registers can be referred to by their hex addresses or by their register names. 16 bit D. d) An 16 bit memory address stored in the PC. → BA24 d. Intel assembly has 8 general purpose 32-bit registers: eax, ebx, ecx, edx, esi, edi, ebp, esp. 1, 2 and 3. This form of the call instruction copies that value directly into the CS:IP register pair. Refer to Special Function Registers for more informat. The extensions for these data types are: -h or -sh for halfwords . word addressable; byte addressable; bit addressable; Tera byte addressable . 32-bit address cannot be embedded in a 32-bit instruction . 65535 or a sign-extended . 1200H. Magnetic core memory. TRISA=0 //making port as output port (write) TRISA=1 //making port as input port (read) Consider a hypothetical processor with an instruction of type LW R1, 20(R2), which during execution reads a 32-bit word from memory and stores it in a 32-bit register R1. Unused locations . Similar to high level languages, ARM supports operations on different datatypes. 38. Both Timer2 and Timer3 are 16-bit timers. Which of the following is a good sequence of assembly instructions to do so? A. Zero flag is a ______ bit flag of 8086 processor. Select one or more: a. RAM & RAM address register : These blocks provide . It composed of a set internal general purpose registers such as AX, BX, CX, and DX. _____ register is designated to point to the 68000 processor stack. It is also referred to as the flag register. Some of these special function registers are bit addressable registers (which means you can access 8 individual bits inside a single byte), while . SETB can operate on the carry flag or any directly addressable bit of a port, register, or RAM location . Exceptional point in 8085 microprocessor 16 bit additional can only be possible by using an instruction DAD. Use only R4 from the programming model. 2017 . Special function registers (Bit addressable registers) The 8051 microcontrollerconsists of 256 bytes . 2. In many respects, this is equivalent to the immediate addressing mode since the value this instruction copies into the CS:IP register pair immediately follows the instruction. a) 8 and 8. (. 7FH bits address; - SFR registers; The following addresses are NOT bit addressable, . Manipulation of individual bits is a function of the instruction set, not of the target bytes. These modes are selected by bit-pairs (M1, M0) in TMOD register. TRISB. Although the range of values is limited at 0 – 9999, the data representation is the same as a 16-bit unsigned integer Hint A flag register used in 8086 is a special purpose register, with 16 bits, it is changed to 0/ 1 after arithmetic and logic operation. R0 and R1 registers can hold an 8-bit . The ISA is bit-addressable; The ISA is byte-addressable; The ISA is 128-bit addressable ; A zero-address machine is a stack-based machine where all operations are done using values stored on the operand stack. However, on a 16-bit CPU where a register can only hold 64k different addresses, you wouldn't likely do this. The following information can be obtained from the memory chip representation shown above: 1. In micro-controller registers were data is stored, if one could manipulate its content bit by bit it’s called a bit addressable ( 0x20 to 2F). The outputs are disabled and the inputs are read during an I/O Write cycle when the CPU is programming the 8237A control registers. 4) Flag or Status Register. e. For historical reasons, a read to the PC returns the address of the current instruction plus 8. 44. synchronized as well as asynchronized d. 16 bytes from 20H to 2FH locations are set aside for bit-addressable read/write . The syntax of this data type is : name of bit variable; Example: bit c; It is a bit series setting within a small data region that is mainly used with the help of a program to memorize something. Register Indirect addressing. The width of the data bus reflects the maximum amount of data that can be processed and delivered at one time. g: For PORT A. Which of the following registers is used to keep track of address of the memory . 4 bits for opcode, 3 for src/dest register, 3 bits for base register -- remaining 6 bits are used as a signed offset. a. 3. A bit is a tiny electronic signal. When the address is 15 and B/H = 0 the read data will be the half word starting at address 14. a) power mode. I jal: jump to an address and simultaneously save the address of the following instruction (return address) in $31: jal ProcedureAddress I Assume A calls B which calls C I A is about to call B: 1. These controllers have a special function register in which additional bits of the address are written before the access. ADD C. 200 If the base register is loaded with value 12345 and limit register is loaded with value 1000, which of the following memory address access will not result in a trap to the . Find the TMOD value for both dimer ble me inter 1, mode 2 software start / stop (gate = 0), with the clock coming from the 8051's crystal 10. 3. The control register that stores the 32-bit linear address, at which the previous page fault is detected is a) CR0 b) CR1 c) CR2 d) CR3 Answer: c Explanation: The control register, CR2, is used to store the 32-bit linear address, at which the previous page fault is detected. i. SAM d. In the below IE register, bit corresponding to 1 activates the. The on-chip oscillator is stopped in. 8251 is programmed by a 16-bit Control Word Register. I'm not sure what you mean by "bit-addressable" bytes. TMOD Register. Scale: A 2-bit constant factor that is either 1, 2, 4, or 8. Each of these timers is assigned a 16-bit reg. 206a See x86 Flags for details. , the number of bits stored in the memory) a. Example: j Label 4 - 16 op offset Consider the following registers: 1. The lower 32 bits, 16 bits, and 8 bits of each register are directly addressable in operands. These flags can then be tested by conditional jump instructions. Identify the addressing mode for each of the following: a. Ans: A. used for storing data and parameters . I've attached a 4x4 LED matrix to the output register. 68. 25. Show Answer. A bit A j in the argument register is compared with all the bits in column j of the array provided . System bus b. The address of the current instruction is kept in a 32-bit register called the program counter (PC), which is register R15. The accumulator holds the results of the computer operations ONLY. The bit addressable area is formed by the 16 bytes next to register banks. The router had to ARP for the MAC address of the next hop IP address. VAM b. 4 bit B. If the most significant bit of relative address byte is 1, then the short jump instruction is. This is so because addresses of locations in memory are 32 bit numbers, and consequently you can address up to 2 32 locations, i. $31 contains return address for B. Each PORT has its own TRIS register E. A direct memory access (DMA) transfer replies. In the bit-addressable RAM of 8051, among the byte addresses 99H a. To read or write to a specific bit within a holding register, simply append the location of the bit as demonstrated in these examples: [DL240]HR1024. 256 35. 7. CPSR: Current Processor Status Register ARM core uses CPSR to monitor & control internal operations. d. TMOD(Timer Mode) is an SFR. Translate the following instructions from English into the machine language described in Appendix C. The return address 21 is stored in memory location 135 and control continues with the subroutine program starting from address 136. 200 C. c) 20 and 16. Q15) What are the types of interrupts in 8051? Ans: External interrupt 0 (IE0). This type of data type is mainly used for allowing the bit addressable memory of random access memory like 20h to 2fh. This register is mainly used to switch between the mentioned banks. 10 will read and write to the 11th bit of the holding register. D7 D6 D5 D4 D3 D2 D1 D0 most significant bit (MSB) least significant bit (LSB) Bit-addressable This register is bit addressable. one C. 2009 . Is 68000 computer Byte addressable? a) True . Split timer mode TH0/TL0->Timer 0 16 bit register (byte addressable only) 8 bits can be send at a time. Operands residing in processor registers are specified with a register address. This addressing mode moves a byte or word between a memory location and a register. So, number of tag bits=40−5−13=22. None of above . The address of this register is 89H. 00111, which are the bits ADn-1-AD1 of the address. 40. store 0110 0110 in AL. However, Bits 18-19 in the Configuration Register are forced on the address bus when reading . A register address is a binary number of k bits that defines one of 2 k registers in the CPU. by Ahmer ilyas - 23:10:00. The STATUS register is located at address 03h (the ‘h’ means the number is in Hexadecimal). It might be said to have 8 KB of memory, but it does not support byte addressing. 22 mai 2019 . Fig. or register ¾ It is registers, RAM, and I/O ports that need to be bit-addressable ƒ . So what we have done now is set bit 5 on our STATUS register to 0. The 8 bit Stack Pointer (SP) register is used by the 8051 to hold internal RAM . Assume each value starts at address To calculate the physical address of the memory, BIU uses the following formula: Physical Address = Base Address of Segment * 16 + Offset Example: The value of Data Segment Register (DS) is 2222H. One D flip-flop is equivalent to a 1-bit register, so a collection of D flip-flops is necessary to store multi-bit values. 2020 . Q3. It has been allotted two addresses in the special function register bank, for its two bytes DPH and DPL. The value of rs, rd, rt should be the actual register number, and can fit in five bits since there are 32 registers. ­Normally PC increments sequentially except for branch instructions The arrows on either side indicate that the PC A byte is whatever number of bits someone decides it should be. c. This is 4K words, addressed 0 to 4,095 inclusive. My circuit has 16 bit input and output registers. 41. There is/are ____ 16-bit register(s) in the 8051 microcontroller. a set of memory location in R/W memory reserved for storing information temporarily during the execution of a program. Among of the some Mostly used Registers named as AC or Accumulator, Data Register or DR, the AR or Address Register, program counter (PC), Memory Data Register (MDR) ,Index register,Memory Buffer . Which of the following are invaild uses of immediate addressing mode? . 3) Special function register-. After the fetch and decode phases, PC contains 21, which is the address of the next instruction in the program (referred to as the return address). MOV R2, 07 Direct d. Which of the following statement (s) is/are correct? If MN/MX’ is low, 8086 cannot be associated with any co-processor. The flags register is a collection of single-bit flags. Set 8 - Microcontrollers & Applications Test Questions. Its data bus is 8-bit wide and hence, 8 bits of data can be transmitted in parallel from or to the microprocessor. Corresponding bit in this register enables particular interrupt like timer, . 112 B. The input and output registers in the Marie simulator have 16 bits, though they only display the lower byte when set to ASCII mode. addi $4, $0, 0x4567 sll $4, $4, 8 addi $4, $4, 0x89AB B. 2 GB of RAM while 64-bit systems will enable you to store up to 17 Billion GB of RAM; 32-bit processors need a 32-bit operating system whereas 64-bit processors can run either on 32 or 64 64-bit operating systems. Halves d. instruction accomplishes the same thing as the following operation: ADD A,04h . e. MOV R4, #60H 2. Consider the following two points about the SFR addresses. 1. Example: integer and character are 8 bits. The PSW register is a bit and byte-addressable register. If MN/MX’ is high, 8086 is in Minimum Mode. Internally, MuP21 maintains a 21 bit data/address bus. bit addressable. 2. - If values 0 to F are moved into an 8-bit register such as WREG, the rest of the bits are assumed to be all zeros. 2 ARM Register set Register structure in ARM depends on the mode of operation. The status register, FLAGS, is a collection of 1-bit values which reflect the current state of the processor and the results of recent operations. four parallel 8-bit ports, which are programmable as well as addressable . 2, 3 and 4. 4. . Q1. Explanation: The power control register, PCON consists of power down bit and idle bit which activate the power down mode and idle mode in 80C51BH. The content of control word register determines synchronous or asynchronous operation, Baud rate, number of bits per . It also selects DRAM memory when low, and SRAM or I/O when high. If the number of address bits in a memory is reduced by 2 and the addressability is doubled, the size of the memory (i. ANSWER: (c) 16-bit register. P0 (Port 0). The 8051 architecture consists of the following features. B (B Register, Addresses F0h, Bit-Addressable): The "B" register is used in two instructions: the multiply and divide operations. Answer. For a load it is in bit positions 20:16 (Rt), while for an R-type instruction it is in bit positions 15:11 (Rd). Any access to SFR registers is an example of direct addressing. Registers frequently hold pointers which reference memory. A two-way set-associative cache has lines of 16 bytes and a total cache size of 8 K bytes. Group of bits processor uses to inform memory which element to read/write is collectively known as. If MN/MX’ is low, 8086 can be associated with any co-processor. a) Program counter-. All these features are available in a 40 pin package as in an 8 bit processor. The destination register is in one of two places. producing particulars goods and. Read data byte from CMPS03 7. Priority and Preemption. 2052 Explanation: BIOS is used by the operating system. In division and multiplication, one of the numbers must be in AX(32-bit) or AL(16-bit). SETB PSW. so the instruction contains the address of the register. 1. The lower the preemption level, the more important the interrupt. H and L register Which of these 8-bit registers of 8085 microprocessor can be paired together to make a 16-bit register? answer choices. You may declare these variables as shown below: int bdata ibase; /* Bit-addressable int */ char . Consider the following two instructions . Since it has 1 bit to enable or disable a channel, there is only 1 register needed, and the master merely writes the register data after the slave address, skipping the register number. il y a 23 heures . These all 32 registers are divided into 4 banks, each bank has 8 r. R14 is the link register which stores a subroutine return address. In this mode, the 16-bit address of a memory byte is specified in the instruction. The PC is a state element that holds the address of the current instruction. Calling Conventions AC must also be 24 bits. The 8051 microcontroller has _____ bytes of bit-addressable memory. It is a 16-bit register that contains a higher byte (DPH) and lower byte (DPL) of a 16-bit external data RAM address. The 16-bit 0xFFFE is then inserted between these two 24-bits for the 64-bit EUI address. More on that later. These Multiple Choice Questions (MCQ) should be practiced to improve the Microprocessor skills required for various interviews (campus interview, walk-in interview, company interview), placements, entrance exams and other competitive examinations. 3. Explanation: The 8086 microprocessor is a 16-bit microprocessor having 20 address lines and 16 data lines. The ALU or shifter is used to find the exact location of one of the operands in. Both A and B 101) Which register is connected to the memory by way of the address bus: a. 5=0 . The sign bit is located in bit 7 in a byte integer, bit 15 in a word integer, and bit 31 in a doubleword integer. The two simplest branch instructions are: BCR Branch on Condition Register. The idea of a mask is that we are providing a list of values of the CC. It executes “boot” microprogram which is sequence of microinstructions stored in ROM. • Each row, implemented by a register, has a length typically equivalent to the word size of machine. 2020 . These registers can work in pair to hold 16-bit data and their pairing . The effective address of the memory location is obtained by the addition of a constant 20 and the contents of register R2. B. Similarly, the accumulator and B register contents ‐bit addressable. The Flag or Status register is a 16-bit register which contains 9 flags, and the remaining 7 bits are idle in this register. As the name suggests, Boolean or Bit Manipulation Instructions deal with bit variables. Size of data count register of the DMA controller = 16 bits. Suppose we have a memory and a direct-mapped cache with the following characteristics. The PR2 register of Timer2 is an 8-bit register. 16-bit register d. When programming the WREG of PIC, the following points should be noted: - Values can be loaded directly into the WREG. The result of the instruction MOV AL, 65 H is to _______. What are issues related to stack and bank 1. • It can refer to 32-bit chip. Internal Memory Instruction Register Acc Accumulator B Temporary register Instruction decoder/ control logic C AC F0 RS1 RS2 OV P PSW . (iii) 80 bytes of general purpose area (Scratch pad memory) as shown in the diagram below. byte address 0 holds the first double word and byte address 8 holds next double word. 56000H. Therefore, the effective address of the memory location pointed by the CS register is calculated as follows: Effective address= Base address of CS register X 10 H + Address of IP. All operations assume a two’s complement representation. A 36 bit address can address 2^36 bytes in a byte addressable machine. 14) How many bytes of bit addressable memory is present in 8051 based . 08H-0FH c. This register, which holds the address, is called the pointer register and is said to point to the operand. Here, the opcode field indicates the 6-bit main opcode, while the 5-bit fields rt, rs and rd select the target register and one or two source registers for the instruction: The I-type or immediate instructions hold a 16-bit field; depending on the instruction this is interpreted as an unsigned integer in the range 0. 4 (a) N 8-Bit Memory Locations; (b) M 16-Bit Memory Locations • Normally, memory is In case of a 64-bit system, memory addresses are allocated by 8 bytes, 4 bytes for 32-bit systems, and 2 bytes for 16-bit system. Bit Addressable. example of a single-register device would be an 8-bit I2C switch, which is controlled via I2C commands. . C. 2: 1. a. MOV B, #34H Immediate b. This may put the limitation on the maximum delay that can be generated using the . Each separate CPU address would refer to a different 2 bytes of memory, instead of discarding the low bit. The carry flag bit is not modified by which arithmetic operations? 8. e. LOAD register 6 with the hexadecimal value 77. Which of the following . Starting address of memory segment. • Processor can write only one register per cycle. The content of the control buffer register generates control signals and next-address information for the sequencing logic unit. Data Space in the Chip = 64K X 8 2. If the ISR is too long, place an unconditional jump from 0003H to the starting address of ISR (which is placed at some other location of program memory). The accumulator holds data AND the results of computer operations. Q. LDAA $1004. These 2 bits determine the framing of data by specifying number of bits per . ;16-bit address, such as ;1234H. Ans: Option c) 11. The program status word (PSW) register is an 8-bit register. A 64-bit processor has a 64-bit data bus and can communicate 64-bits of data at a time, and whether the data is read or written is determined by the control bus. The call instruction stores the return address for a subprogram (a) on the stack (b) in the memory address register (c) in the program counter (d) does not involve using the return address 204 The instruction je label is an example of (a) indirect addressing (b) indexed addressing (c) relative addressing (d) immediate addressing With PC-relative mode, can only address data within 256 words of the instruction. PERSONAL USE OF STUDENTS FOLLOWING SYLLABUS. 32-bit systems limited to 3. . Send a start sequence again (repeated start) 5. Note: 1. Ans. In an 8-bit processor (such as the 68HC11) with a 16-bit address bus, this works out to be 2 16 = 65,536 = 64K of memory. 2018 . It is used to configure and identify the hardware in a system such as the hard drive, floppy drive, optical drive, CPU, and memory. 4 B. 3, during a read, the least significant bit of the address, AD0 is used only to select the proper byte if B/H=1. 255 34. . A 32 bit segmented address immediately follows the call opcode. C. This is done Power Control for Peripherals register (PCONP - address 0x400F C0C4) bit description Following reset the PCADC (Power Clock Control Bit to ADC) bit is cleared and the ADC is disabled. ADC Interfacing with 8051 The following circuit shows the interfacing of ADC with 8051. D. modes. And a 40-bit IR register is available in control unit. Accumulator register is preferred to use in arithmetic, logic, and data transfer operations. 13 4567 31 4 0 8. not bit-addressable (ex: DPH) Any data larger than 8-bits must be broken into 8-bit chunks before it is processed. AR holds the effective address 135. For instance: B'1101' B'0110' B'1111'. (vii) Which of the following is not a characteristic of a RISC architect. Name the default offset registers to access the data from stack segment register of 8086 microprocessor. To be safe you can use the term octet - an octet is always, always, eight bits. Both d8 and X n . 256 D. Score: 0 Accepted Answers: 10H-17H If RS0 = 1 and RS1 = 0, the register bank address range is 00H-07H 08H-0FH 10H-17H 18H-1FH No, the answer is incorrect. 2031 1, 3 and 4. It will load the register R3 with the contents of the memory location M [PC+36] It will load the register R3 with the relative address itself (PC+36) ; It will store the register R3 content to the memory location M [PC+36] It will left rotate the value of R3, 36 times and will store the result into R3 a. This includes registers, like esi, whose lower 8 bits were not previously addressable. Data Types. (Available only in CHMOS). Answer:A . When an external interrupt . 12 nov. → 2677 b. c) 80 bytes byte addressable locations . . It has 20-bit address line. . Temporary register ALU 8-bit Internal data bus DATA BUS (External) 8 bit Memory Address Register (Uses P0 and P2) DPTR P. This instruction uses three bytes of memory: one byte is the op-code, and two more bytes are needed to specify the 16-bit memory address. For example, a 4M × 8 SRAM provides 4M entries, each of which is 8 bits wide. Direct Addressing: the address is “the immediate”. The MSB bit 20 is the carry bit in ALU operations. Q10. • Each register (more commonly referred to as a memory location) has a unique address; memory addresses usually start at zero and progress upward. Only registers R0, R1 and DPTR can be used as pointer registers. Any subset of the registers, or all the registers, may be specified. Ans: B. (b) Carry . Writing to or reading from these registers may produce undefined . Cache memory. View Answer Ans : D Explanation: Program counter : It is a 16-bit register used to store the memory address location of the next instruction to be executed. Also, 8-bit values (8, -3, def, and b) are placed into consecutive bytes in memory with . asm file is given below after the code. The MARIE has a 12–bit address space and a 16–bit addressable memory, so it supports 2 12 words of memory. All this happens during one clock pulse. 4 as SCON is a bit addressable register. (d) effective address – physical address Answer : a 29. stack pointer & program counter are two special function register these are those register which are used only by microprocessor not by user. Some of these special function registers are bit addressable (which means you can access 8 individual bits inside a single byte), while some others are only byte  . Immediate addressing B. Explanation 8051 microcontrollers have 16 bytes of bit addressable memory. 47. Effective address or Offset: An offset is determined by adding any combination of three address elements: displacement, base and index. Which of the following is true while executing data transfer instructions? a. both operands can be direct/indirect register operands: d. a 16 bit memory address stored in the program counter. - Moving a value larger than 255 (FF in hex) into the WREG register will truncate the Operands residing in memory are specified by their memory address. Destination Index (DI): It stores the offset address of the Destination. 16 . An address in the main memory is called (A) Physical address (B) Logical address (C) Memory address (D) Word address. True or false. , 1/2 the native CPU word size) for better performance with instructions that don't need 32-bit words. Send 0xC1 ( I2C address of the CMPS03 with the R/W bit high (odd address) 6. Which of the following represent the function(s) of the accumulator (A register)? A. Control memory is part of ______ that has addressable storage registers and used as temporary storage for data: a. B and C register 3. 14 in page 184 for an example 32-bit instruction format · The address field may refer to register address, memory address or constant data · Two types of addresses are defined. Which of the following registers is a bit addressable? SBUF; TMOD; PCON; PSW. Since the size of a page 8K bytes (2^13), the number of addressable pages is 2^36 / >2^13 = 2^23 With 4 byte entries in the page table we can reference 2^32 pages. Each register contains a binary number made up of bit positions 15 to 0. The other one whose data manipulate byte by byte is called byte-addressable(GPR register is a byte-addressable). The following table highlights the differences between a microprocessor and a microcontroller: . will load the A register with the contents of memory location $1004. Only 89H is bit-addressable d. 20 avr. We saw in Chapter 3 that D flip-flops can be used to implement registers. A register file is a collection of kregisters (a sequential logic block) that can be read and written by specifying a register number that determines which register is to be accessed. Register. 2017 . will cause both unemployment and. Base Register(BX) Base Register is the register, hold the address of the base storage location from where the data were stored continuously. Each port has an 8 bit register. See full list on technobyte. synchronized b. and. 64 C. 69. 10) Which general purpose register holds eight bit divisor and store the . This register, which holds the address, is called the pointer register and is said to point to the operand. 24 nov. Send 0x01 (Internal address of the bearing register) 4. 1600H. b. a 16 bit register in microprocessor. FIGURE 4. Add the address of memory location array_base to the contents of number register %esi to determine an address in memory. . 11. If the IR is to contain the whole instruction, it will have to be 32 bits long. Essentially, it is just a 32-bit register which holds the instruction address and is updated at the end of every clock cycle. The first subscript gives the word number and the second specifies the bit position in the word. . All of the 4 register are byte . The 256 M byte main memory is Byte addressable. ) SFR IE at byte address A8H Bit No. The control register that stores the 32-bit linear address, at which the previous page fault is detected is . 149. The Atmel AVR instruction set is the machine language for the Atmel AVR, a modified Harvard . 2. It has 8-bit data bus. The 8051 microcontroller consists of 256 bytes of RAM memory, which is divided into two . Bit. And GPR is a Byte addressable register and SFR is a Bit addressable register. a) A7 register . A special function register can have an address between 80H to FFH. 32-bit CPU with memory addressable in 16-bit words (i. Question: Indicate Which Of The Following Registers Are Bit-addressable. (a) Large . Movement of values between registers and memory is very common. As you know, the 68000 has a 32 bit Program Counter and 32 bit address registers. 224 Answer: C. 2019 . 16-bit register d. This section focuses on "8086 Microprocessor". 13 oct. 8085 Microprocessor 8086 Microprocessor It is 8-bit Microprocessor It is 16-bit Microprocessor It has 16-bit address line. This makes the chip less expensive to manufacture. Venkat Saturday, April 21, 2018 MPMC , nptel. Which one of the following main memory blocks are mapped onto the set ‘0’ of the cache memory? Set 3 - Microcontrollers & Applications Test Questions. . A microprocessor has a 32-bit address line. IE: Interrupt Enable Register (bit addressable). c. Three such possibilities are: Option 1: LD. In many respects, this is equivalent to the immediate addressing mode since the value this instruction copies into the CS:IP register pair immediately follows the instruction. 8-bit b. A 32 bit segmented address immediately follows the call opcode. b) 16 and 16. What is the job of the TMOD register? -bit register 9. 0 will read and write to the first bit of the holding register. TRISA and TRISB. index). A. com Which of the following RAM locations are bit addressable a) 20H-2FH b) OOH-OFH c) 70H-7FH d) IOH-IFH No, the answer is incorrect. b. 2018 . The result of this operation is shown in part (b) of the figure. Data that can be . Register ACC is bit-addressable 5. 0. Address Space in the Chip = =16 bits. The address space is the array of all addressable memory locations. This address is obtained by connecting 7th bit of direct address of an instruction with two bits (RP1, RP0) from STATUS register as is shown on the following picture. This can only be done for segments (data, code, task state, and local . 2028 A register is the only place where math can be done (addition, subtraction, etc). Bit-addressable (ex: P0) vs. 32-bit register. When an instruction is fetched from memory then it is stored in the program counter C. The test carries questions on topics such as Serial Communication & SCON Register of 8051, Serial Communication Modes of 8051, Multi-Processor Communication of 8051, Addressing Modes of MCS-51, Data Transfer Instructions in MCS-51, Arithmetic Instructions in MCS-51, Logical Instructions in MCS-51, Boolean Variable Manipulation . We know that there is a special bit-addressable area in the RAM and some of the Special Function Registers (SFRs) are also bit . The value (in hex) loaded into TH for each of the following. This form of the call instruction copies that value directly into the CS:IP register pair. Which one of the following register(s) that is/are programmer invisible and is/are required to hold an operand or result value while the bus is busy transmitting some other value? Instruction Register Memory address register Memory Buffer Register Registers A and C Carry Flag: It occupies the zeroth bit of the flag register. Displacement addressing D. relocation register and a limit register (or bound register). This address is formed by adding an appended 16 bit segment address and a 16 bit offset address. MVI A, 55H. The value 1 describes it as an output and value 0 shows input. o Source address. . R4, 128 (R0); If the descriptor denoted by the given selector (in memory or a register) is visible at the CPL, LSL loads the specified 32-bit register with a 32-bit, byte granular, unscrambled limit that is calculated from fragmented limit fields and the G-bit of that descriptor. Also referred to as SCON. We define an initialization ritual as a program executed during start up that initializes hardware and software. MOV A, 50H Direct c. It is a 16-bit register used to store the memory address location of the next instruction to be executed. None of these 102) How many bit of MAR register: a. In order to read a word from memory location 5000AH in a single bus cycle , the status of the 8086 signals A0 and BHE¯ should be. Instruction Pointer (IP) 54000H. In either case, we use a mask. If the page size is 4KB, what is the approximate size of the page table? (GATE 2001) (a) 16 MB (b) 8 MB (c) 2 MB (d) 24 MB Answer: (c) Explanation: A page entry is used to get address of physical memory. Microprocessor 8086 MCQ Questions. Here is an example showing how a the MAC Address is used to generate EUI. The remaining two unused bits are user-definable flags. org Explanation: Bits of PSW register are CY, AC, F0, RS1, RS0, OV, -, P so for selecting bank2 RS1=1 and RS0=0 which are fourth and third bit of the register respectively. RS1 bits of PSW Register. Figure 8. In the following example, table cells represent bytes, and the cell numbers indicate the address of that byte in Main Memory. The memory location of a particular byte from one megabyte of memory is calculated as segment start address. 67. asynchronized c. 5 a) Bit 5 of Register b set to 1 b) Bit 5 of port PI is set to O C) Bit 5 of port PI is set tol d) Bit 1 of portP5 is set to 1 Choose the Bit addressable memory location in the SFR of 8051 controller, 20H through 2AH; 20H through 2CH; 20H through 2DH; 20H through 2FH; Select output of the following program stored in A register, MOV A,#85H; CPL A; ADD A,#1; 7AH; 7BH; 7CH; 7DH; Identify nature of 8051 coding process below, L1:MOV A, MOV P2,A; JNB P2. It uses memory location 18H to 1FH. SFR a) Register b) Cache c) Main memory d) Disk Answer: (d) 6. The data types we can load (or store) can be signed and unsigned words, halfwords, or bytes. Statement B sets 4th bit of flag register. None is bit-addressable 13. Direct Addressing is done through a 9-bit address. Microcontroller MCQ Quiz & Online Test: Below is few Microcontroller MCQ test that checks your basic knowledge of Microcontroller. This form of the call instruction copies that value directly into the CS:IP register pair. • Data memory is byte also addressable, and loads and stores can read and write exactly 8 bits. The memory is byte addressable. c. Whenever a program reads or writes a value in memory the CPU needs the memory address. The 16-bit offset for branch equal, load, and store is always in positions 15:0. 2: Bit Values of IE Register of 8051 Microcontroller To enable any of the interrupts, first the EA bit must be set to 1. 8-bit register c. Only data objects that occupy the bit-addressable area of the 8051 internal memory . Which register holds a count for some instructions? 6. The instruction @ address 1 must be a branch to address 300, the address Load effective address •Compute address, save in register, do not access memory •LEA: immediate mode CSE2405-15 PC-Relative Addressing Mode Want to specify address directly in the instruction •But an address is 16 bits, and so is an instruction! •After subtracting 4 bits for opcode and 3 bits for register, we have 9 bits available for . 65536 Answer: C. address B. The Intel Pentium Pro microprocessor uses 36 address lines to . b. This problem has been solved! in 8051 there are many bit-addressable registers such as A (ACC), B, SCON, PCON, TCON, p0,p1,p2,p3 . store 42H in AL. If the value V (x) of the target operand is contained in the address field itself, the addressing mode is (A . 5. At present, the most common used are 32-bit register and 64-bit register. The only exception to this rule is that you . We are now back in Bank 0. Serial-In Parallel-Out(SIPO) In the Serial-in Parallel-out shift register, the data is inserted bit by bit serially. 30 juil. 4: Not the 8051 PROBLEMS 5. This is normally limited to 32 bits even in 64-bit mode but can be 64-bits with a few select encodings. Please take a look at the picture below. (ii) Which flag of the 8085's flag register is not accessible to programmer directly? (a) Zero flag. During DMA cycles the most significant 8 bits of the address are example of a single-register device would be an 8-bit I2C switch, which is controlled via I2C commands. Another way to say this is that the lb instruction loads the register with a 32-bit sign extended version of the byte at the designated address. c) A set of memory locations in R/W memory reserved for storing information. For example, the instruction . Byte address. For example, the first bit (bit 0) of the second element in file 3 (Binary) would be addressed as B3:2/0. In which of these modes, the immediate operand is included in the instruction itself? . 118). 4)In total 21 SFRs only 11 SFRs are Bit — Addressable SFRs and these SFRs also Byte . The register list is a 16 bit field in the instruction, with each bit corresponding to a register. MVI C, 25H. Find the frequency and period used by the timer if the crystal attached to the 8051 has the following values. Which of the following registers is not bit addressable? Q2. LOAD register 7 with the contents of memory cell 77. The incrementer increments the content of the control address register by one, to select the next microinstruction in sequence. The Microprocessor places _____ address on the address bus A. 3. SAM c. The contents of the accumulator after this operation MOV A, #0BH ANL A, #2CH will be a) 11010111 b) 11011010 c) 00001000 d) 00101000. 42) What is the bit addressing range of addressable individual bits over the on-ch. 16-bit timer 3. and other constants to be represented by symbols rather than bit . Microprocessor Interfacing Assignment Answers [NPTEL] If [CS]=348AH, [IP]=4214H, then the 20-bit physical address from which the code is accessed will be. It has to fetch two 8-bit data at a time. Thus a CPU with 16 processor registers R0 through R15 will have a register address field of four bits. Similar Questions; 1. A 36 bit address can address 2^36 bytes in a byte addressable machine. PORT 1 Pins consists of 8 – bit bidirectional I/O Port with internal pull – up resistors. In its default configuration, the top 7 bits of the priority register allow you to define the preemption level. 2152 4 bit B. Boolean or Bit Manipulation Instructions. What will be the corresponding logic address In a program operating with execution-time binding having the physical address as 300 with relocation register set to 100. A crash course in x86 addressing modes. Put simply, a register is a hardware device that stores binary data. The Modbus register will be read from the slave once, and the 16-bit data will be shared with successive maps or rules, with each map or rule selecting its bit of interest. one C. 16-bit c. Which operator is the most important while assigning any instruction as register indirect. The effective address of the operand is obtained by adding the 8-bit constant and the contents of the index register to the contents of An, which can be any address register. 20 7654 Address Address 56. —rs is a source register—an address for loads and stores, or an operand for branch and immediate arithmetic instructions. Index: Content of index register SI or DI. 8) Which among the below mentioned devices of MCS-51 family does not . A 32 bit segmented address immediately follows the call opcode. To solve this problem, the Intel engineers designed the CPU so that it computes 20 bit absolute addresses by combining the segment with the offset (i. b. From the 6 bits, the four of the flags are called conditional flags. This 16-bit register is divided into two bytes—the first byte corresponds to Mode Instruction Format while the second byte corresponds to Command Instruction Format. (The assembler gives special mnemonics to each bit address. ANSWER: (a) synchronized The registers, accumulator, PSW, B, P0, P1, P2, P3, IP, IE, TCON and SCON are all bit-addressable registers. A limited number of instructions operate on 16-bit register pairs. It is a bit addressable . 1500H. None is bit-addressable Answer: d. Following diagram shows how TLB and . Contents of register A after the execution of the following 8085 microprocessor program is. For further information on Cortex-M4 memory address and memory mapped peripherals, read the following article: Accessing Memory Mapped Peripherals Registers of Microcontrollers; The 32-bit also means the size of internal registers of the processor. It counts 16 bits at a time. It is an 8-bit register, which holds the temporary data of arithmetic and logical operations. MPMC Week 12 Assignment. 8. MOC d. Displacement: An integral offset. 29. Since the size of a page 8K bytes (2^13), the number of addressable pages is 2^36 / >2^13 = 2^23 With 4 byte entries in the page table we can reference 2^32 pages. Nine of the sixteen bits are used in the 8086: Carry (bit 0): set if the last arithmetic operation ended with a leftover carry bit coming off the left end of the result. an 8 bit register in microprocessor. Eight bits are sufficient for external I/O expansion decoding or for a relatively small RAM array. Which of the following is not a component of paging unit? a) page directory b) page descriptor base register c) page table d) page. lui $4, 0x4567 addiu $4, $4, 0x89AB E. The control register that stores the 32-bit linear address, at which the previous page fault is detected is a) CR0 b) CR1 c) CR2 d) CR3. I B is about to call C: ARM7: A 32 bit Microcontroller (part 2) Status Registers: There are two types of status registers are used. Which of the following registers are not bit addressable? SCON PCON A PSW. 32-bit d. 84. A Register is a group of flip-flops with each flip-flop capable of storing one bit of information. Contents of RY = Contents of memory address (5000 + 100) = 400 The contents of register R4 become 400 after instruction 1. JUMP to the instruction at memory location 24 if the contents of register 0 equals the value in register A. (a) Content Addressable Memory. The purpose of MOVS instruction is: DIFFERENCE BETWEEN 8085 AND 8086 MICROPROCESSOR The difference between 8085 and 8086 are given below. Jump to B (using jal) 3. Register addressing is a form of direct addressing. Show the assembly code required to pull this off. Like other bit-addressable SFRs, the PSW bits have predefined mnemonics that the assembler will accept in lieu of the bit address. 22 févr. Workspace. Which instruction is used to check the status of a single bit? Q3. Replaces the target with the value specified by the DATAWORD directive. If the arithmetic operation results in a carry(if result is more than 8 bit), then Carry Flag is set; otherwise it is reset. Increases by 2^(address bits)/addressability III. TMOD is used to . b) An 16 bit register in the microprocessor. DPTR is a 16-bit register that is also accessible in low-byte and high-byte formats. For example: TRANSMIT BIT PSW. In the bit-addressable RAM of 8051, among the byte addresses 99H and 89H a. TMOD is a bit-addressable register. inflation Which of the following factors. Which addressing mode is used in pushing or popping any element on or from the stack? Q4. 1000H. 7 juil. 2011 . 1 16-bit. It is a bit and byte addressable register. 32-bit processors have 4 GB addressable space while 64-bit processors have 16 GB addressable space. 1 = 35h (00110101) pin 1 is configured as an input SUBB A,direct - Subtracts the direct byte from the accumulator with a borrow . 13-bit timer 2. In either case, we use a mask. The word length in the 68000 computer is ______ a) 32 bit b) 64 bit c) 16 bit d) 8 bit . Solve it. 00H-07H b. store 40H in AL. MAR b. It is accessed as a 16-bit register or two 8-bit registers. 4. c) one 16-bit register d) one 8-bit register The common register(s) for all the four channels of 8257 is a) DMA address register b) Terminal count register c) Mode set register and status register d) None of the mentioned In 8257 register format, the selected channel is disabled after the terminal count condition is reached when a) Auto load is . 4 janv. = 4042 H X 10 H + 0580 H = (40420 + 0580) H = 41000 H. A. Hence, the processor is said to have a 64K address space. P0 (Port 0, Address 80h, Bit-Addressable): This is input/output port 0. 20H-2FH. 16 bit register, leaving the entire 1Mb of memory seemingly un-addressable. all of the mentioned D. d) ideal mode. 80H. a . Note that if an 8- or 16-bit register is addressed, only that portion of the 32-bit register changes without affecting the remaining bits. 32-bit register. 1 Integers Integers are signed binary numbers held in a byte, word, or doubleword. string data types. In the first type, the contents of register R0 or Rl of current register bank provide an 8-bit address that is multiplexed with data on port 0. 2. Speed and number of address bits. Modes 0, . . ANSWER: (c) 16-bit register. This register can be programmed to configure these timers or counters. we set bit 5 of the STATUS register to 0. MDR c. The unused part reserved for future expansion. The idea of a mask is that we are providing a list of values of the CC. Elements are addressed by number following the colon after the file designator, and individual bits within each element addressed by a number following a slash mark. RAM. 1. 9. best wishes, drdigital. Register is a very fast computer memory, used to store data/instruction in-execution. Flexibility and Speed B. R0 and R1 registers can hold an 8-bit . Explanation: T. Select the single-bit instructions from the following instructio. scratch pad memory. Branching is achieved by specifying the branch address in one of the fields of the microinstruction. as page directory physical base address register is. Displacement: It is an 8 bit or 16 bit immediate value given in the instruction. 18 Which of the following registers are not bit addressable? a) SCON . The NVIC contains a group of priority registers with an 8-bit field for each interrupt source. The label STRX has the value 0h, which is the location of the first initialized byte. 3 bits to address a register => 32 Ð 10 = 22 bits for address => max . A bit addressable area of 16 bytes occupies RAM byte addresses 20h to 2fh, forming total . The call instruction stores the return address for a subprogram (a) on the stack (b) in the memory address register (c) in the program counter (d) does not involve using the return address 204 The instruction je label is an example of (a) indirect addressing (b) indexed addressing (c) relative addressing (d) immediate addressing The status register contains information relevant to the operation of the I/O device. 67b 255 D. In that case, the reset . When two 16-bit numbers are added the answer can be 17 bits long, this extra bit that won’t fit in the target register is placed in the where it can be used and . These 32 bytes are divided into four register banks in which each bank has 8 . 31-12 11-6 5-0 For each configuration (a and b): What is the cache line size (in words)? For ease of chip manufacture, we split the 22-bit address into an 11-bit row address and an 11-bit column address. The 8 most significant bits of the address are transmitted by the address bus, (Pins A 8, to A 15 ). The PSW register is 8 bits wide, but only 6 bits of it are used by the 8051 microcontroller. Table 3: Byte & Bit Addresses for 8051 Hardware Register . 65) The capture operation in counter mode is feasible when mode of CCP module is _____ The T1CON register is a bit-addressable register. e. The segment register's reference memory on even 16 byte boundries. . It facilitates the users storing 16-bit data temporarily. The following is the . For this reason, RAM accesses with 16-bit addresses are substantially slower. The minimum number of transistors required to implement a CMOS 3 input OR gate is a . Which of the following is not a component of paging unit? a . Answer: All you have to do is make sure that the effective address is 128. 64-bit 103) MOC stands . 9) What is the mean of the Booting in the operating system? Restarting computer. The bit sequence will look like . The Microprocessor places _____ address on the address bus A. E. The first is that it is possible for security modules to register a callback. 0