Instruction Set and Programming with 8085 · Microprocessors · GATE ECE

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Marks 1

GATE ECE 2017 Set 1
The clock frequency of an 8085 microprocessor is 5 MHz. If the time required to execute an instruction is 1.4 $$\mu $$s, then the number of T-states ...
GATE ECE 2016 Set 3
In an 8085 microprocessor, the contents of the accumulator and the carry flag are A7 (in hex) and 0, respectively. If the instruction RLC is executed,...
GATE ECE 2015 Set 3
Which one of the following 8085 microprocessor programs correctly calculates the product of two 8-bit numbers stored in registers B and C?
GATE ECE 2015 Set 2
In an 8085 microprocessor, which one of the following instructions changes the content of the accumulator?
GATE ECE 2015 Set 1
In an 8085 microprocessor, the shift registers which store the result of an addition and the overflew bit are, respectively.
GATE ECE 2013
For 8085 microprocessor, the following program is executed. At the end of program, accumulator contains...
GATE ECE 1998
An instruction used to set the carry flag in a computer can be classified as
GATE ECE 1997
The following instructions have been executed by an 8085 $$\mu $$P From which address will be text instruction be fetched?...
GATE ECE 1996
The following sequence of instructions are executed by an 8085 microprocessor: 1000: LXI SP< 27FF 1003: CALL 1006 1006: POP H The contents of t...
GATE ECE 1996
The total number of memory accesses involved (inclusive of the op-code fetch) when an 8085 processor executes, the instruction LDA 2003 is
GATE ECE 1995
An 'Assembler' for a microprocessor a used for
GATE ECE 1993
In a microprocessor, the register which holds the address of the next instruction to be fetched is
GATE ECE 1992
The following program is run on 8085 microprocessor: At the completion of execution of the program, the program Counter of the 8085 contains _______...
GATE ECE 1989
In a microprocessor system, the stack is used for
GATE ECE 1988
In register index addressing mode the effective address is given by

Marks 2

GATE ECE 2017 Set 1
The following five instructions were executed on an 8085 microprocessor. MVI A, 33H MVI B, 78H ADD B CMA ANI 32H The Accumulator value immedia...
GATE ECE 2016 Set 1
In an 8085 system, a PUSH operation requires more clock cycles than a POP operation. Which one of the following options is the correct reason for thi...
GATE ECE 2014 Set 4
An 8085 microprocessor executes “STA 1234H” with starting address location 1FFEH (STA copies the contents of the Accumulator to the 16-bit address lo...
GATE ECE 2011
An 8085 assembly language program is given below. Assume that the carry flag is initially unset. The content of the accumulator after the execution of...
GATE ECE 2010
For the 8085 assembly language program given below, the content of the accumulator after the executions of the program is 3000 MVI A, 45H 3002 MOV...
GATE ECE 2008
An 8085 executes the following instructions 2710 LXI H, 30A0H DAD H PCHL All addresses and constants are in Hex. Let PC be the contents of the p...
GATE ECE 2007
An 8085 assembly language program is given below. Line 1: MVI A, B5H 2: MVI B, 0EH 3: XRI 69H 4: ADD B 5: ANI 9BH 6: CPI 9FH 7: STA 3010H 8:...
GATE ECE 2007
An 8085 assembly language program is given below. Line 1: MVI A, B5H 2: MVI B, 0EH 3: XRI 69H 4: ADD B 5: ANI 9BH 6: CPI 9FH 7: STA 3010H 8:...
GATE ECE 2006
Following is the segment of a 8085 assembly Language program: LXI SP, EFFF H CALL 3000 H 3000H: LXI H, 3CF4H PUSH PSW SPHL POP PSW RET On c...
GATE ECE 2005
Consider an 8085 microprocessor system The following program starts at locaton 0100H. LXI SP, 00FF LXI H, 0107 MVI A, 20H SUB M The contents ...
GATE ECE 2005
Consider an 8085 microprocessor system If in addition following code exists from 0109H onwards ORI 40H, ADD M What will be the result in the accumu...
GATE ECE 2004
The number of memory cycles required to execute the following 8085 instructions (I.) LDA 3000H (II.) LXI D, FOF 1H Would be
GATE ECE 2004
It is desired to multiply the numbers 0AH by 0BH and store the result in the accumulator. The numbers are available in registers B and C respectively....
GATE ECE 2004
Consider the sequence of 8085 instructions given below. LXI H, 9258 MOV A, M CMA MOV M, A Which one of the following is performed by this sequ...
GATE ECE 2003
In an 8085 microprocessor, the instruction CMP B has been executed while the content of the accumulator is less than that of register B. As a result ...
GATE ECE 2002
Consider the following assembly language program. The execution of the above program in an 8085 microprocessor will result in ...
GATE ECE 2002
The contents of Register (B) and Accumulator (A) of 8085 microprocessor are 49H and 3AH respectively. The contents of A and the status of carry flag (...

Marks 5

GATE ECE 1994
Write down the sequence of Instructions which are actually (till HLT instruction), if the program begins with the location 1FF5H. ...
GATE ECE 1991
The program given below is run on an 8085 based microcomputer system. Determine the contents of the registers: PC, SP, B, C, H, L after a half instr...
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