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Retaining a few kilobytes of RAM through the deepest sleep costs

  • A.as much as keeping the entire device in a lighter mode
  • B.more than reinitialising from flash on every wake
  • C.a fraction of a microampere, far less than keeping the whole RAM alive
  • D.nothing at all, retention being free

Answer: C

A small retained block lets the design carry its state across a sleep whose alternative is a full restart, and the leakage of a few kilobytes is well under a microampere. Deciding what must survive and what can be recomputed is the design work.

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