Question

Zero flag is not affected in ______ instruction.

Options

• XRA A

• SUB A

• CMP A

• MVI A, OOH

Answer 1

Zero flag is not affected in MVI A, OOH instruction.

Explanation:

MVI A, 00H is a data transfer instruction, and data transfer instructions do not affect any flags in the flag register.
On the other hand, XRA A, SUB A, and CMP A are arithmetic/logical instructions, and they modify the Zero flag based on the result.