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The figure that decides whether a deep mode is worth entering for a short sleep is

  • A.the energy consumed in waking and re-initialising
  • B.the static current of the very deepest mode, taken alone
  • C.the number of wake sources the mode supports
  • D.the size of the retained memory region

Answer: A

A mode saving a microampere but costing ten milliseconds and a full reinitialisation is a loss for anything waking every second. The comparison must be made in energy per cycle rather than in current, which is the mistake most often made.

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