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The reason an 8-bit device may still be chosen over a 32-bit one for a simple product is

  • A.unit cost, package size and quiescent current
  • B.its greater arithmetic precision
  • C.its larger addressable memory
  • D.its shorter interrupt latency in every case

Answer: A

For a thermostat or a toothbrush the 32-bit part's performance is irrelevant and the pennies and the microamps are not. The 8-bit part loses on precision and reach, and modern 32-bit parts have largely closed the cost gap, which is why the class is shrinking.

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