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In the lightest sleep mode of a typical microcontroller

  • A.the clock to every peripheral is stopped
  • B.the core is halted but the peripherals and RAM continue
  • C.the RAM contents are lost and must be restored on waking
  • D.only an external pin can wake the device

Answer: B

Halting the core alone saves the largest single consumer while leaving timers, converters and serial ports running, so waking costs nothing and no state is lost. It is the mode a tickless idle loop enters between one event and the next.

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