13.5.6.3.3 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

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