Discussion
In which addressing mode the contents of a register specified in the instruction are first decremented, and then these contents are used as the effective address of the operands?
Answer: D
Correct answer: auto decrement
In auto-decrement addressing the register named in the instruction is first stepped back and only then used as the effective address. The order matters: decrement-then-use is what makes it the natural complement of auto-increment for pushing onto a stack that grows downwards.
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