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For that same 16-bit timer clocked at 8 MHz, a period of exactly 1 ms is obtained with a prescaler of 1 and a reload value of

  • A.1000
  • B.65536
  • C.125
  • D.8000

Answer: D

At 8 MHz one millisecond is eight thousand ticks, which fits comfortably in sixteen bits with no prescaling and therefore gives the finest resolution available. The same reasoning at 1 MHz would need a reload of a thousand.

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