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Q#1 Microprocessor GATE EE 2006 MCQ +2 marks -0.66 marks

In an 8085 microprocessor based system, it is desired to increment the contents of memory location whose address is available in (D, E) register pair and store the result in same location.  The sequence of instructions is

XCHG

INR M

XCHG

INX H

INX D

XCHG

INR M

XCHG

Explanation:

First XCHG instruction must be executed to transfer the memory address from DE register pair to HL register pair.

Then we can use INR M instruction to increase the content of memory location pointed to by HL register pair.

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