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Pin count should be tallied against

  • A.the number of interrupt sources the core supports
  • B.the number of timer channels the device provides
  • C.every signal the design needs plus supply, ground and debug pins
  • D.the number of peripherals listed in the datasheet

Answer: C

It is easy to count the signal pins and forget several supply and ground pairs, the reset pin and the debug interface, and then find the package one pin short. The pin multiplexing table also has to allow the chosen functions to coexist.

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