GATE EC 2015 Set 2 — Question 25
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Digital Circuits → Computer Organization → Machine Instructions & Addressing
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Question
In an 8085 microprocessor, which one of the following instructions changes the content of the accumulator?
Correct answer
(D) SBI BEH
Solution
In the 8085 microprocessor:
1.MOV B,M: Moves the content of the memory location pointed to by the HL register pair into register B. The accumulator remains unchanged.
2.PCHL: Copies the contents of the HL register pair into the Program Counter (PC). The accumulator remains unchanged.
3.RNZ: A conditional return instruction (Return if Not Zero). It affects the Program Counter based on the Zero flag but does not modify the accumulator.
4.SBI BEH: Subtract with Borrow Immediate. It subtracts the immediate 8-bit data () and the status of the Carry flag from the accumulator (). This instruction directly modifies the content of the accumulator.
Therefore, the correct option is D.Continue learning with Success Tracker
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