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Computer Science AQA A level

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Question:

Describe the 4 steps for an interrupt to be dealt with via the vectored interrupt method

Author: Will Parker



Answer:

1. An interrupt is detected as a change in the content of the status register between the execute and fetch stages of the fetch-execute cycle 2. The processor stops executing the current program and places the content of its registers onto the system stack 3. It loads the appropriate interrupt service routine 4. Restores the backed up previous data and carries on


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