In an 8085 microprocessor, the contents of accumulator, after the following instructions are executed will become
XRA A
MVI B F0H
SUB B
(a) 01 H (b) 0F H (c) F0 H (d) 10 H
Description : In an 8085 microprocessor, the contents of the Accumulator, after the following instructions are executed will become XRA A MVI B, F0 H SUB B (A) 01 H (B) 0F H (C) F0 H (D) 10 H
Last Answer : In an 8085 microprocessor, the contents of the Accumulator, after the following instructions are executed will become XRA A MVI B, F0 H SUB B (A) 01 H (B) 0F H (C) F0 H (D) 10 H
Description : The stack pointer in the 8085 microprocessor is a: a) 16 bit register that points to stack memory locations b) 16 bit accumulator c) Memory location in the stack d) None of The Above
Last Answer : a) 16 bit register that points to stack memory locations
Description : In an 8085 microprocessor, the instruction CMP B has been executed while the contentsof accumulator is less than that of register B. As a result carry flag and zero flag will berespectively (A) set, reset (B) reset, set (C) reset, reset (D) set, set
Last Answer : (A) set, reset
Description : Accumulator based microprocessor example are: a. Intel 8085 b. Motorola 6809 c. A and B d. None of these
Last Answer : c. A and B
Description : The zero flag of 8085 microprocessor is to be set keeping the content of the accumulator unchanged. Which instruction is to be used? (a) MOV A,A (b) ANI 00H (c) XRA A (d) CMP A
Last Answer : The zero flag of 8085 microprocessor is to be set keeping the content of the accumulator unchanged. Which instruction is to be used? (a) MOV A,A (b) ANI 00H (c) XRA A (d) CMP A
Description : The contents of Register (BL) and Register (AL) of 8085 microprocessor are 49H and 3AH respectively. The contents of AL, the status of carry flag (CF) and sign flag (SF) after executing 'SUB AL, BL' assembly language instruction, are ( ... ; CF=0; SF=0 (3) AL=F1H; CF=1; SF=1 (4) AL=1FH; CF=1; SF=1
Last Answer : Answer: 3
Description : The Complement Accumulator (CMA) instruction of 8085 processor on execution affects a. Zero Flag b. Sign Flag c. Carry Flag d. None of the flags
Last Answer : B
Description : List the four instructions which control the interrupt structure of the 8085 microprocessor.
Last Answer : • DI ( Disable Interrupts ) • EI ( Enable Interrupts ) • RIM ( Read Interrupt Masks ) • SIM ( Set Interrupt Masks )
Description : Which of the following instructions is not available in 8085 microprocessor? (A) LDA 3850 (B) XTHL (C) push PSW (D) LDAXH
Last Answer : Which of the following instructions is not available in 8085 microprocessor? (A) LDA 3850 (B) XTHL (C) push PSW (D) LDAXH
Description : What is the size of SP register in 8085 microprocessor? A) 16 bits B) 8 bits C) 64 bits D) 48 bits
Last Answer : What is the size of SP register in 8085 microprocessor? A) 16 bits B) 8 bits C) 64 bits D) 48 bits
Description : In 8085 microprocessor with memory mapped I/O which of the following is true? (1) I/O devices have 16 bit addresses (2) I/O devices are accessed during IN and OUT instructions (3) There can be a maximum of 256 input and 256 output devices (4) Logic operations can not be performed
Last Answer : I/O devices have 16 bit addresses.
Last Answer : In a 8085 microprocessor system with memory mapped I / 0, arithmetic and logic operations can be directly performed with the I / 0 data.
Description : The content of the accumulator after the execution of the following 8085 assembly language program, is: MVI A, 42H MVI B, 05H UGC: ADD B DCR B JNZ UGC ADI 25H HLT (A) 82 H (B) 78 H (C) 76 H (D) 47 H
Last Answer : (C) 76 H
Description : The content of the accumulator after the execution of the following 8085 assembly language program, is MVI A, 35H MOV B, A STC CMC RAR XRA B (A) 00H (B) 35H (C) EFH (D) 2FH
Last Answer : (D) 2FH
Description : Describe Briefly The Accumulator Register Of 8085.?
Last Answer : Answer :It is one of the most important 8 bit register of 8085 It is responsible for coordinating input and output to and from the microprocessor through it. The primary purpose of ... logical operations. This accumulator register is mainly used for arithmetic, logical, store and rotate operations.
Last Answer : A single instruction to clear the lower four bits of the accumulator I 8085 assembly language is: ANI FOH
Description : The contents of accumulator before CMA instruction is A5H. Its content after instructionexecution isa) A5H b) 5AH
Last Answer : b) 5AH
Description : Write A Program That Will Store The Contents Of An Accumulator And Flag Register At Locations 2000h And 2001h.?
Last Answer : Answer :By making use of the Push & Pop instructions the program can be written as: LXISP, 4000H - this step initiates the SP at 4000h. PUSH PSW - the contents of the accumulator and flag are pushed into the stack. POP B MOV A, B STA 2000H MOV A, C STA 2001H HLT
Description : The act of writing new data into register (1) is possible only when the register is an accumulator (2) is possible only when the register is an accumulator or instruction register (3) erases the previous contents of the register (4) is non-destructive to existing contents
Last Answer : is possible only when the register is an accumulator or instruction register
Description : If the contents of an accumulator are Ex-ORed with itself and placed in the accumulator itself, then A) Carry flag will be set B) The accumulator contains all 1’s C) The zero flag is set D) The accumulator contents are shifted left by one bit
Last Answer : If the contents of an accumulator are Ex-ORed with itself and placed in the accumulator itself, then The zero flag is set
Description : In an 8085 microprocessor, after the execution of XRA A instruction A) the carry flag is set B) the accumulator contains FFH C) the zero flag is set D) the accumulator contents are shifted left by one bit
Last Answer : In an 8085 microprocessor, after the execution of XRA A instruction the zero flag is set
Description : In microprocessor the next instruction to be executed is stored in a) Program Counter b) Stack Pointer c) Memory Pointer d) Accumulator
Last Answer : Ans: Program Counter
Description : In Microprocessor one of the operands holds a special register called: a. Calculator b. Dedicated c. Accumulator d. None of these
Last Answer : c. Accumulator
Description : When a subroutine is called, the address of the instruction following the CALL instructions stored in/on the a. stack pointer b. accumulator c. program counter d. stack
Last Answer : d. stack
Description : What is Microprocessor 8085?
Last Answer : 8085 is a 8 bit microprocessor designed by Intel.
Description : What is the microprocessor - 8085 architecture?
Last Answer : 8085 Architecture - II Written by: shankar â⠬¢ Edited by: KennethSleightPublished Sep 30, 2009 â⠬¢ Related Guides: IntelLearn in detail about the functions and working of flags, the timing ... ALU alone cannot successfully process a data and provide the result to the programmer. There are
Description : How many operations are there in the instruction set of 8085 microprocessor?
Last Answer : There are 74 operations in the 8085 microprocessor.
Description : List the 16 – bit registers of 8085 microprocessor.
Last Answer : Stack pointer (SP) and Program counter (PC).
Description : What is Microprocessor? Give the power supply & clock frequency of 8085
Last Answer : A microprocessor is a multipurpose, programmable logic device that reads binary instructions from a storage device called memory accepts binary data as input and processes data according ... provides result as output. The power supply of 8085 is +5V and clock frequency in 3MHz.
Description : What type of architecture is used in 8085 microprocessor?
Last Answer : Ans- INTEL 8085 is a 8-bit microprocessor. It's based on Von-Neumann architecture in which the data and instructions are in the same memory space without any distinction between them. Data line: 8-bits--Can ... of data at a time. Address line: 16-bits--Can address upto 2^16(64KB) of address space.
Description : What is function of ALE in 8085 microprocessor?
Last Answer : Ans-AlE stands for the address latch enableit 's working is that it differentiate the address and data bus in microprocessor.when it is high it select address bus .when it is low it select data bus.
Description : How many speed of 8088,8085,8086 microprocessor: a. 2.5 Million instruction per second b. 1.5 Million instruction per second c. 3.5 Million instruction per second d. 1.6 Million instruction per second
Last Answer : a. 2.5 Million instruction per second
Description : Which is 16 Bit microprocessor: a. 8088 b. 8086 c. 8085 d. All of these
Last Answer : d. All of these
Description : The___ was very successful in the calculator market at that time: a. Motorola 6800 and 6809 b. Microprocessor 4004 c. Intel 8085 d. None of these
Last Answer : b. Microprocessor 4004
Description : Microprocessor 8085 can address location upto a. 32K b. 128K c. 64K d. 1M
Last Answer : c. 64K
Description : To put the 8085 microprocessor in the wait state(i) lower the-HOLD input (ii) lower the READY input (iii) raise the HOLD input(iv) raise the READY input
Last Answer : (ii) lower the READY input
Description : Explain Briefly The Flag Register In The 8085 Microprocessor.?
Last Answer : Answer :The flag register in 8085 is an 8-bit register which contains 5 bit positions. These five flags are of 1bit F/F and are known as zero, sign, carry, parity and auxiliary carry. ... addition and subtraction operations. The parity flag is used for results containing an even number of one's.
Description : Mention The Various Functional Blocks Of The 8085 Microprocessor.?
Last Answer : Answer :The various functional blocks of the 8085 microprocessor are: Registers Arithmetic logic unit Address buffer Increment / decrement address latch Interrupt control Serial I/O control Timing and control circuitry Instructions decoder and machine cycle encoder.
Description : How Can Signals Be Classified For The 8085 Microprocessor?
Last Answer : Answer :The signals of the 8085 microprocessor based on their functions can be classified into 7 categories namely: Frequency and power signals Address and data buses The control bus Interrupt Signals Serial Input / Output signals DMA signals Reset Signals
Description : The RST 7 instruction in 8085 microprocessor is equivalent to: (A) CALL 0010 H (B) CALL 0034 H (C) CALL 0038 H (D) CALL 003C H
Last Answer : (C) CALL 0038 H
Description : Which of the following 8085 microprocessor hardware interrupt has the lowest priority? (A) RST 6.5 (B) RST 7.5 (C) TRAP (D) INTR
Last Answer : Answer: D
Description : Which of the following in 8085 microprocessor performs HL = HL + DE ? (A) DAD D (B) DAD H (C) DAD B (D) DAD SP
Last Answer : (A) DAD D
Description : 8085 microprocessor has ............. hardware interrupts. (A) 2 (B) 3 (C) 4 (D) 5
Last Answer : (D) 5
Description : In 8085 microprocessor, the digit 5 indicates that the microprocessor needs (1) -5 volts, +5 volts supply (2) +5 volts supply only (3) -5 volts supply only (4) 5 MHz clock
Last Answer : Answer: 2
Description : Enlist the features of 8085 microprocessor.
Last Answer : Features of 8085 microprocessor: 1. 16 address line so 216=64 Kbytes of memory can be addressed. 2. Operating clock frequency is 3MHz and minimum clock frequency is 500 KHz. 3. On chip bus ... cycle TTL clock 10. Provide 2 serial I/O lines, so peripheral can be interfaced with 8085 μp
Description : State the functions of temporary registers of 8085 microprocessor.
Last Answer : Temp Register (8 bits) is also called as operand register as it is used by μp for storing one of the operands during an operation and also for storing the result of any execution temproary.
Description : List any four salient features of 8085 microprocessor
Last Answer : Features of 8085: 1. 16 address line so 216=64 Kbytes of memory can be addressed. 2. Operating clock frequency is 3MHz and minimum clock frequency is 500 KHz. 3. On chip bus controller ... duty cycle TTL clock 10. Provide 2 serial I/O lines, so peripheral can be interfaced with 8085 μp
Description : The 8085 Microprocessor has A) 8-bits Data bus and 16-bits Address bus B) 8-bits Data bus and 8-bits Address bus C) 16-bits Data bus and 16-bits Address bus D) 32-bits Data bus and 8-bits Address bus
Last Answer : B) 8-bits Data bus and 8-bits Address bus.
Description : The clock frequency of an 8085 microprocessor based system is 3 MHz. What should be the minimum pulse width of the INTR signal so that it is recognized successfully? A) 5.6 µs B) 5.7 µs C) 5.8 µs D) 5.9 µs
Last Answer : The clock frequency of an 8085 microprocessor based system is 3 MHz. What should be the minimum pulse width of the INTR signal so that it is recognized successfully? A) 5.6 µs B) 5.7 µs C) 5.8 µs D) 5.9 µs
Description : In 8085 microprocessor, how many T-states does OPCODE FETCH machine cycle normally require (i.e., when HOLD and WAIT signals are NOT forced)? A) 4 to 6 B) 3 to 8 C) 2 to 3 D) 8 to 12
Last Answer : In 8085 microprocessor, how many T-states does OPCODE FETCH machine cycle normally require (i.e., when HOLD and WAIT signals are NOT forced)? A) 4 to 6 B) 3 to 8 C) 2 to 3 D) 8 to 12