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RVUNL EE Microprocessor & Microcontroller Quiz 2

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Question 1

In the instruction DCR and INR, which of the following flag bit is not affected?

Question 2

What is the RST for the TRAP and what is address of it?

Question 3

The below given program is executed by 8085 microprocessor

ANI 00H

LXI, FFFFH

LOOP: DCX B

NOP

JNZ LOOP

HLT

The number of times NOP will be executed is __________

Question 4

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

Question 5

A main memory unit with a capacity of 4 MB is built using 1M x 1-bit DRAM chips. Each DRAM chip has 1K row of cells with 1K cells in each row. The time taken for a single refresh operation is 100 nsec. The time required to perform one refresh operation on all the cells in the memory unit is

Question 6

The program given below is run on an 8085 based microcomputer system. Determine the contents of the registers SP and C after a halt instruction is executed

2000 H :LXI SP, 1000 H

LXI H, 2F37 H

XRA A

MOV A, H

INX H

PUSH H

CZ 20FF H

JMP 3000 H

HLT

20FF H :ADD H

RZ

POP B

PUSH B

RM

3000H :HLT

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