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Write short note on Interrupt driven I/O.
i/o device • 9.5k  views
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  • This technique is used to overcome the limitation of programmed I/O.
  • In interrupt driven I/O, instead of making the processor to verify the status of I/O module. It is the responsibility of I/O module to intimate the processor by interrupt signal.
  • CPU responds to interrupt signals and stores the return address from the program counter (PC) into the memory stack and then the control branches to a interrupt service routine (ISR).
  • ISR processes the required I/O Transfer.
  • After completion of executing interrupt routine CPU returns to previous program and continue what it was doing before.

Interrupt:

  • An interrupt or exception causes CPU to transfer the control temporarily from its current program to another program i.e. interrupt handler.
  • Block Diagram for Interrupt Driven I/O

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