What is Prescalar and Postscalar

Prescalar and Postscalar:

  • Prescalar divides the input pulse before the counter and Postscalar divides the output of the counter. 
  • Both effectively increase the range of the counter. 
  • Both prescalar and postscalar used to get our desired frequency from basic reference. 
  • The prescalar divides the reference frequency by some specific factor (which is entered into clock register/PLL register) and thus helps in reducing frequency, Postscalar does the opposite function. 
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