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Q#1 Microprocessor GATE EE 1996 MCQ +2 marks -0.66 marks

In a 8085 microprocessor, the following instructions may result in change of accumulator contents and change in status flags. Choose the correct match for each instruction.

(a)=> (T)

(b)=> (S)

(c) => (P)

(a)=> (T)

(b)=> (P)

(c) => (S)

(a)=> (P)

(b)=> (S)

(c) => (T)

None

Explanation:

ANA r: ANDs the content of register with accumulator which modifies the content of accumulator and resets the carry flag and sets the AC flag.

XRA r: Ex-ORs the contents of a register with the accumulator. So, the contents of accumulator are modified. It resets both CY and AC flag.

CMP r: Compares the contents of register r with accumulator but contents of both registers are preserved. Contents of CY flag will change depending on the result. AC = unchanged.

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