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A brown-out detector holds a microcontroller in reset while

  • A.the external crystal has not yet stabilised
  • B.the watchdog counter is still running
  • C.the flash memory is being erased
  • D.the supply is below the level at which the device works reliably

Answer: D

Between about a volt and the guaranteed operating minimum a device may execute instructions wrongly and corrupt its own flash, so the detector asserts reset through that band. A separate oscillator start-up timer handles the crystal.

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