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Counting the PWM channels a design needs before selecting a part matters because

  • A.timer channels are shared and often conflict with other functions
  • B.PWM channels cannot be generated in software at all
  • C.each channel requires its own external crystal
  • D.the number of channels fixes the maximum clock frequency

Answer: A

A datasheet's headline count is the total across timers, and two channels may share a timer and therefore a period, or a pin may be needed for something else. The pin multiplexing table rather than the feature list is what has to be checked.

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