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Leaving an unused peripheral's clock enabled costs

  • A.extra flash
  • B.dynamic power in a block doing nothing useful
  • C.nothing
  • D.only leakage

Answer: B

A running timer or converter switches its logic at the clock rate whether or not anything reads it, and several such blocks add up to a substantial fraction of the running current. Enabling clocks only for the peripherals in use is the cheapest saving available.

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