On receiving an interrupt from an I/O device, the CPUs

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Question

On receiving an interrupt from an I/O device, the CPUs

Vivek Kumar · Accepted Answer

branch off to interrupt service subroutine after completion of current instruction. Explanation: When an device sends an interrupt signal to the , the following sequence typically occurs: Instruction Completion: The does not stop what it is doing mid-way through an operation. It finishes executing the current instruction first to maintain the integrity of the program state. Saving State: Before branching, the saves the current state (like the Program Counter and registers) onto the stack so it can return to exactly where it left off. Branching: Only after the current instruction cycle is complete does the branch to the Interrupt Service Routine (ISR) or subroutine.

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NIMCET 2009 — Computer PYQ

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