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GATE 2020: Digital Electronics Quiz 5

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Question 1

In order to retrieve the relearn address from the stack memory, what instruction is used by every interrupt?

Question 2

In an 8085 A microprocessor based system, it is desired to increment the contents of memory location whose address is available in (D, E) register pair and store the result in same location. The sequence of instructions is

Question 3

Consider the following instruction [X is any number from 0 to F]
STC
MVIA, X0H
RRC
RRC
RRC
RRC
HLT
After execution of above instructions in INTEL 8085 the content of accumulator will

Question 4

The content (in Hexadecimal) of some of the memory locations in an 8085A based system are given below:

The contents of stack pointer (SP), program counter (PC) and (H,L) are 2700H, 2100H and 0000H respectively. When the following sequence of instructions are executed,
2100 H: DAD SP
2101 H: PCHL
the contents of (SP) and (PC) at the end of execution will be

Question 5

A portion of the main program to call a subroutine SUB in an 8085 environment is given below.
:
:
LXI D,DISP
LP : CALL SUB
:
It is desired that control be returned to LP+DISP+3 when the RET instruction is executed in the subroutine. The set of instructions that precede the RET instruction in the subroutine are

Question 6

Consider the assembly language program given below
1) MVI A, 00 H
2) STC
3) CMC
4) DCR A
5) RAL
6) OUT PORT 2
7) HLT
If the above program is executed in 8085 then output at PORT 2 is

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ESE & GATE EE Digital Electronics

Jul 3ESE & GATE EE