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Unit 3: Assembly Language Programming of 8085

4. ........................... is generally used when an error occurs in a program and an instruction Notes
needs to be eliminated.
(a) HLT (b) OUT
(c) MVI (d) NOP
5. Which of the following instructions can only load data into Accumulator

(a) IN (b) OUT
(c) LOAD (d) MVI
6. The ........................... instructions specify the memory location explicitly.
(a) NOP (b) jump
(c) go to (d) continue

3.9 Review Questions

1. Discuss the 8085 Programming Model.
2. Explain in detail the branching operations.
3. With example explain different groups of instruction sets.

4. Write an 8085 assembly language program to perform 32-bit binary addition.
5. What will be the value in ACC, for the given 8085 program below?
MVI C, 7F
MVI B, 3E
MOV A, B
RLC
RLC
ANI 7F
HLT

6. Write an 8085 assembly language program to fill a block of 1000 bytes starting at address
H
9000 with characters 2B .
H H
7. Indicate the logic levels on each control or status pin as logic ‘0’ or logic ‘1’ for 8085
microprocessor with the given data below:

Machine cycle RD WR IO/M S S
0 1
Memory write
Memory read

I/O read
I/O write
O/P code fetch

8. Explain the different data format.
9. Describe the instruction format in detail.

10. With suitable examples, explain the addressing modes of 8085.

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