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A non-maskable interrupt is one that

  • A.is generated only by an external pin
  • B.does not save any context before running
  • C.cannot be disabled by software
  • D.has the lowest priority in the system

Answer: C

It is reserved for conditions that must be handled whatever the software is doing, typically a supply failure or a memory error. Because it cannot be blocked, its handler must be written to run safely at any moment, which is a strong constraint.

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