Define subroutine. Explain the execution of subroutine function.

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Module 3: Instruction Set and Programming

20247m

Define subroutine. Explain the execution of subroutine function.

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Subroutine – see Q70

Definition, CALL pushes PC, RET pops, types LCALL/ACALL, stack use, example DELAY routine. RETI for interrupt return. Benefits: modular, recursive via stack.

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