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Interrupt latency is the interval between

  • A.the interrupt being asserted and the first instruction of the handler running
  • B.two successive interrupts from the same source
  • C.the start and the end of the service routine
  • D.the interrupt being enabled in software and the peripheral becoming ready

Answer: A

It comprises the time to finish or abandon the current instruction, to save context and to fetch the vector, and a core intended for real time work quotes it as a fixed number of cycles. What the handler then does is its execution time, not its latency.

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