An accumulator contains ______ after the execution of the followi

An accumulator contains ______ after the execution of the followi
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An accumulator contains ______ after the execution of the following instructions in an Intel 8085 Microprocessor:

MVI A, 7FH; MVI B, AAH; XRA B

A. DFH

B. AFH

C. 00H

D. D5H

Please scroll down to see the correct answer and solution guide.

Right Answer is: D

SOLUTION

MVI r, Data: This instruction directly loads a specified register with an 8-bit data given within the instruction. The register ‘r’ is an 8-bit general purpose register such as A, B, C, D, E, and L.

MVI A, 7F H: This instruction will load 7FH directly into the ‘A’ register.

MVI B, AA H: This instruction will load AAH directly into the ‘B’ register.

XRA r: This instruction logically XOR’S the contents of specific register with the contents of

Accumulator & stores the result in the Accumulator.

A ← A ⊕ r;

XRA B: This instruction will logically XOR’S the contents of ‘B’ register with contents of Accumulator.

A ← A ⊕ B

The truth table for an XOR operation is as shown:

 

∴ The accumulator will contain (D5)H

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