Interrupt driven I/O transfer of micro-processor

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Describe the sequence of events that characterize the interrupt driven I/O transfer from point of view of: a) Processor b) I/O module (ISR)

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Interrupt driven I/O transfer of micro-processor



Once the interrupt is activated, the microprocessor follows these steps.

  1. It save the address of next instruction in stack and finishes the current instruction.
  2. It also saves the current status of all the interrupts.
  3. Jump to interrupt vector table that holds the address of ISR (interrupt serves routine).
  4. Execute the interrupt until it reaches to RETI (return from interrupt)
  5. The processor now returned to the location where it was interrupted. 

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