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Explain the sequence that takes place when an interrupt occurs.

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By Dipali Umre

When an interrupt occurs, sequence of following six steps takes place :

  1. Interrupt Recognition: The processor notices that something needs attention, either from within the system or from an external device.
  2. Status Saving: To make sure the current process isn’t messed up by the interruption, the processor saves all its important settings.
  3. Interrupt Masking: Initially, the processor ignores all other interruptions to focus on dealing with the current one. Later, it might allow higher-priority interruptions.
  4. Interrupt Acknowledgment: The processor tells the interrupting device, “Got it, I’ll handle this.”
  5. Interrupt Service Routine: Now, the processor starts dealing with the issue. It might need to figure out what exactly needs attention and how to address it.
  6. Restoration and Return: Once the problem is solved, the processor puts back all the settings it saved, making sure everything goes back to normal as if nothing happened.
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