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Work is deferred from an interrupt handler to a task chiefly to

  • A.allow the handler itself to be written in a high level language
  • B.let the handler use floating point arithmetic
  • C.avoid the need to clear the peripheral's interrupt flag
  • D.keep the handler short and the latency of other interrupts low

Answer: D

Time spent in a handler is time every other source waits, so the handler does the urgent minimum and signals a task to do the rest. The pattern is variously called deferred interrupt processing, a bottom half or a deferred procedure call.

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