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The deepest sleep or shutdown mode of a device typically

  • A.continues to run the core at a reduced clock frequency
  • B.can be left only by an external interrupt on a data pin
  • C.loses the RAM contents apart from a small retained region
  • D.retains the whole of the RAM and every peripheral's state

Answer: C

Power is removed from most of the die and a few kilobytes of backup RAM and the real time clock are kept alive, so waking is effectively a reset with a little state preserved. That reinitialisation is the cost that has to be weighed against the microamperes saved.

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