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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