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Recent questions and answers in Microprocessors and Microcontrollers

1 answer 33 views

The register AX is formed by grouping ________  A. AH & AL B. BH & BL C. CH & CL D. DH & DL

answered Sep 29, 2018 in Microprocessors and Microcontrollers
1 answer 37 views

The IF is called as _________ A. initial flag B. indicate flag C. interrupt flag D. inter flag

answered Sep 28, 2018 in Microprocessors and Microcontrollers
1 answer 20 views

The OF is called as _______ A. overflow flag B. overdue flag C. one flag D. over flag 

answered Sep 28, 2018 in Microprocessors and Microcontrollers
1 answer 24 views

The SF is called as ________ A. service flag B. sign flag C. single flag D. condition flag

answered Sep 28, 2018 in Microprocessors and Microcontrollers
1 answer 18 views

The CF is known as ________ A. carry flag B. condition flag C. common flag D. single flag

answered Sep 28, 2018 in Microprocessors and Microcontrollers
1 answer 87 views

The 16 bit flag of 8086 microprocessor is responsible to indicate ___________ A. the condition of result of ALU operation B. the condition of memory C. the result of addition D. the result of subtraction 

answered Sep 28, 2018 in Microprocessors and Microcontrollers
1 answer 24 views

The work of EU is ________ A. encoding B. decoding C. processing D. calculations 

answered Sep 28, 2018 in Microprocessors and Microcontrollers
1 answer 27 views

In 8086 microprocessor , the address bus is ________ bit wide A. 12 bit B. 10 bit C. 16 bit D. 20 bit

answered Sep 28, 2018 in Microprocessors and Microcontrollers
1 answer 99 views

The microprocessor can read/write 16 bit data from or to ________ A. memory B. I /O device C. processor D. register

answered Sep 28, 2018 in Microprocessors and Microcontrollers
1 answer 27 views

The intel 8086 microprocessor is a _______ processor A. 8 bit B. 16 bit C. 32 bit D. 4 bit

answered Sep 28, 2018 in Microprocessors and Microcontrollers
1 answer 22 views

In 1960's texas institute invented ______ A. integrated circuits B. microprocessor C. vacuum tubes D. transistors

answered Sep 28, 2018 in Microprocessors and Microcontrollers
1 answer 20 views

The first digital electronic computer was built in the year________  A. 1950 B. 1960 C. 1940 D. 1930

answered Sep 28, 2018 in Microprocessors and Microcontrollers
1 answer 21 views

The purpose of the microprocessor is to control ______  A. memory B. switches C. processing D. tasks

answered Sep 28, 2018 in Microprocessors and Microcontrollers
1 answer 20 views

Microprocessor is the ______ of the computer and it perform all the computational tasks  A. main B. heart C. important D. simple

answered Sep 28, 2018 in Microprocessors and Microcontrollers
1 answer 28 views

Microprocessor is a/an _______ circuit that functions as the CPU of the compute  A. electronic B. mechanic C. integrating D. processing

answered Sep 28, 2018 in Microprocessors and Microcontrollers
1 answer 26 views

A microprocessor is a _______ chip integrating all the functions of a CPU of a computer.  A. multiple B. single C. double D. triple

answered Sep 28, 2018 in Microprocessors and Microcontrollers
2 answers 69 views

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 

answered Sep 21, 2018 in Microprocessors and Microcontrollers
1 answer 43 views

 In a 16-bit microprocessor, a single word is A) 16 bit data B) 32 bit data C) 8 bit data D) 64 bit data 

answered Jun 18, 2018 in Microprocessors and Microcontrollers
1 answer 43 views

In the 8085A Microprocessor, arithmetic and logical operations are performed through which of the following? A) Stack B) ALU C) I/O D) Register 

answered Jun 18, 2018 in Microprocessors and Microcontrollers
1 answer 85 views

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

answered Jun 18, 2018 in Microprocessors and Microcontrollers
1 answer 44 views

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 

answered Jun 18, 2018 in Microprocessors and Microcontrollers
1 answer 36 views

Then number of T-states of the instruction STA in 8085 microprocessor is A) 10 B) 12 C) 13 D) 16 

answered Jun 18, 2018 in Microprocessors and Microcontrollers
1 answer 31 views

In 8085, whenever a signal is received at TRAP terminal, its program execution is transferred to a subroutine on address A) 0000 H B) 002C H C) 0024 H D) 0004 H

answered Jun 18, 2018 in Microprocessors and Microcontrollers
1 answer 159 views

What is the Power Supply specification for 8085AH microprocessor? A) Single +5V supply with 10% voltage margins B) Dual +5V supply with 10% voltage margins C) Single +10V supply with 5% voltage margins D) Dual +5V supply with 5% voltage margins 

answered Jun 18, 2018 in Microprocessors and Microcontrollers
1 answer 34 views

What is the size of memory which can be accessed by direct accessing in 8085 microprocessor? A) 64 kB B) 4 kB C) 128 kB D) 128 MB 

answered Jun 18, 2018 in Microprocessors and Microcontrollers
1 answer 41 views

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

answered Jun 17, 2018 in Microprocessors and Microcontrollers
1 answer 18 views

The 8O85 assembly language instruction that stores the contents of H and L registers into the memory locations 2050H and 2051H, respectively, is: A) SPHL 2050H B) SPHL 2051H C) SHLD 2050H D) STAX 2050H

answered Jun 17, 2018 in Microprocessors and Microcontrollers
1 answer 11 views

 In a microprocessor, the address of the next instruction to be executed, is stored in A) Stack pointer B) Address latch C) Program counter D) General purpose register

answered Jun 17, 2018 in Microprocessors and Microcontrollers
1 answer 17 views

In 8085 microprocessor, the value of the most significant bit of the result following the execution of any arithmetic of Boolean instruction is stored in the (1) Carry status flag (2) Auxiliary carry status flag (3) Sign status flag (4) Zero status flag

answered May 28, 2018 in Microprocessors and Microcontrollers
1 answer 9 views

8085 microprocessor has ________ individual flags during arithmetic and logic operations.

answered May 24, 2018 in Microprocessors and Microcontrollers
1 answer 60 views

To read or write a complete word from / to the memory in 8086 microprocessor and if it is located at an even address, the number of Read or Write cycles required is

answered May 23, 2018 in Microprocessors and Microcontrollers
1 answer 15 views

In a microprocessor the service routine for a certain interrupt starts from a fixed location of memory which cannot be externally set but the interrupt can be delayed or rejected. Such an interrupt is 

answered May 23, 2018 in Microprocessors and Microcontrollers
1 answer 8 views

When a program is being executed in an 8085 microprocessor, its Program Counter contains  (A) the number of instructions in the current program that have already been executed (B) the total number of instructions in the program being executed. (C) the memory address of the instruction that is being currently executed (D) the memory address of the instruction that is to be executed next

answered May 18, 2018 in Microprocessors and Microcontrollers
1 answer 53 views

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

answered May 18, 2018 in Microprocessors and Microcontrollers
1 answer 10 views

Chock Speed of which Intel microprocessor is 3 GHz?  a. Core 2 Duo b. Core 2 Quad c. Pentium 4 d. Pentium III 

answered May 17, 2018 in Microprocessors and Microcontrollers
1 answer 5 views

Intel's 8085 microprocessor chip contains  (A) seven 8 bit registers (B) 8 seven bits registers (C) seven 7 bit registers (D) eight 8 bit registers.

answered May 17, 2018 in Microprocessors and Microcontrollers
1 answer 16 views

A disk has 500 bytes/sector,100 sectors / track, 20 heads and 1000 cylinders. Total capacity of disk is  (a) 1 GB (b) 100 MB (c) 10 MB (d) 10 GB

answered May 15, 2018 in Microprocessors and Microcontrollers
1 answer 17 views

Suppose that the same clock signal is used to increment the microprogram counter and to load the control register. Which of the following assertion(s) is/are true?  1. Microinstruction execution time is at least two clock periods.  2. Microinstruction execution time can be overlapped with fetching the next microinstruction.  3. Unconditional branch microinstructions must necessarily take longer than other types.  (a) 1 only (b) 2 only (c) 1 and 3 (d) 2 and 3

answered May 15, 2018 in Microprocessors and Microcontrollers
1 answer 5 views

Some system architects do not find RISC instruction repertoire to be cost-effective because it  (a) result in large increase in programme size (b) result in complex structure of microcode (c) has been observed that an average compiler does not employ more than a limited subset of available instructions (d) results in complex decoding of opcode filed resulting in longer execution time

answered May 15, 2018 in Microprocessors and Microcontrollers
1 answer 10 views

A stake machine pushes operands on a stack and evaluates binary operators by a pcs (i.e pop/compute/store) where the top two operands are popped computation is performed and the result is pushed onto stack. Evaluation of an expression (x* y) + (u* ν) by Reverse Polish notation in a stack machine needs  (a) 4 push and 3 pcs instructions (b) 6 push and 1 pcs instructions (c) 4 push and 1 pcs instructions (d) 5 push and 2 pcs instructions 

answered May 15, 2018 in Microprocessors and Microcontrollers
1 answer 27 views

A dot matrix printer takes 3 msec to point a character, and 1 msec for a space between two consecutive characters. If it prints 100 characters per line, its printing speed specifications in characters per second (cps) and time to print a line of characters are respectively  (a) 100 cps and 400 msec (b) 2500 cps and 0.04 sec (c) 250 cps and 40 msec (d) 250 cps and 0.4 sec

answered May 15, 2018 in Microprocessors and Microcontrollers
1 answer 9 views

Consider the following program segment with 8085 microprocessor  LXI H 3600H  MOV A, M  HLT  The MOV instruction involves (a) indirect addressing (b) immediate addressing (c) implicit addressing (d) direct addressing

answered May 15, 2018 in Microprocessors and Microcontrollers
1 answer 19 views

To establish a communication between 8085 microprocessor and 8255 Programmable Peripheral Interface chip. the status of the chip select input would be  (a) TRISTATE (b) HIGH (b) LOW (d) DON’T CARE 

answered May 15, 2018 in Microprocessors and Microcontrollers
1 answer 8 views

Which flag does not change by the execution of the instruction DCR B in 8085 microprocessor ?  (a) Parity (b) Carry (c) Zero (d) Sign

answered May 15, 2018 in Microprocessors and Microcontrollers
1 answer 6 views

What addressing mode is used in the instruction RET?  (a) Direct (b) Immediate (c) Implicit (d) Register-indirect

answered May 15, 2018 in Microprocessors and Microcontrollers
1 answer 13 views

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

answered May 15, 2018 in Microprocessors and Microcontrollers
1 answer 6 views

The 8085 is a – microprocessor   1. 4 bit 2. 8 bit 3. 16 bit 4. 32 bit 

answered May 13, 2018 in Microprocessors and Microcontrollers
1 answer 20 views

Which of the following instructions is not available in 8085 microprocessor? (A) LDA 3850 (B) XTHL (C) push PSW (D) LDAXH

answered Apr 28, 2018 in Microprocessors and Microcontrollers
0 answers 12 views

In a 8085 microprocessor system with memory mapped I/O  a. I/O devices have 8 bit address  b. I/O devices are accessed using IN and OUT instructions.  c. There can be maximum 256 input and 256 output devices  d. Arithmetic and logic operations can be directly performed with I/O data

asked Apr 9, 2018 in Microprocessors and Microcontrollers
0 answers 68 views

An electric iron designed for 110V AC supply was rated at 500W. It was put across a 220V supply. Assuming that at 110V it supplied 500W output (i.e no losses) at the new voltage it will supply  a. 2500W b. 250W c. 500W d. 2000W

asked Apr 9, 2018 in Microprocessors and Microcontrollers
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