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ESE EC : Digital Circuits Champion Quiz 5

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Question 1

In the following 8085 program how many times (decimal) is the DCR C executed?
MVI, 78 H
LOOP :DCR C
JNZ LOOP
HLT

Question 2

What are the number of machine cycles n, and the types of machine cycles carried out for PUSH B?

Question 3

An 8085 microprocessor execut6es the following instructions:
In number are represented in signed 2’s complement form as
P = 11101101 and Q = 11100110
If Q is subtracted from P, the value obtained in signed 2’s complement form is

Question 4

For Opcode fetch operation in 8085 microproessor.

Question 5

The crystal frequency of 8085 microprocessor is 6 MHz. The time required to execute instruction XTHL over this microprocessor.

Question 6

For the 8085 assembly language program given below, the content of the accumulator after the execution of the program is
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Question 7

Consider a memory chip with 1024 bytes storage connected to a 8085 chip address lines (or nay microprocessor with 16 address lines) as below.
What is the range of memory address?
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Question 8

Which of the following instruction copies contents of a memory location, specified by a 16-bit address in the operand into the accumulator?

Question 9

Single instruction to clear the lower four bits of the accumulator in 8085 assembly language is

Question 10

If the CALL instruction of 8085 in the main program is conditional then RETURN instruction in the subroutine can be

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ESE & GATE EC Digital Circuits

Aug 13ESE & GATE EC