19.6.3.3 Selecting the Clock Source for a Peripheral

When changing a peripheral clock source by writing to PCHCTRLm.GEN, the peripheral clock must be disabled before re-enabling it with the new clock source setting. This prevents glitches during the transition:

Disable the Peripheral Channel by writing PCHCTRLm.CHEN = 0.
Assert that PCHCTRLm.CHEN reads '0'.
Change the source of the Peripheral Channel by writing PCHCTRLm.GEN.
Re-enable the Peripheral Channel by writing PCHCTRLm.CHEN = 1.
Assert that PCHCTRLm.CHEN reads as ‘1’.

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