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Module 3: Instruction Set and Programming

20232m

The instruction to copy the content of a memory location using a register indirect addressing mode is?
(i) STAX
(ii) LDAX
(iii) LDA
(iv) None of the above

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Answer: (ii) LDAX

Explanation: In 8085, LDAX B/D (Load Accumulator indirect) copies content of memory location whose 16-bit address is in register pair B-C or D-E into accumulator using register-indirect addressing. STAX does the opposite (A → memory). LDA is direct 16-bit address. Hence LDAX uses register indirect.

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