35.4.1 Processor Clock Ratio

The Processor Clock frequency can be controlled more precisely using PMC_CPU_RATIO.RATIO.

f_{CPU} = \frac{(RATIO + 1)}{16} \times f_{FCLK}

By default, RATIO = 15, and the Processor Clock frequency equals the Free-Running Clock frequency. Modifying the RATIO field modifies the frequency of the Processor Clock with a frequency step of f_FCLK/16.

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