29.6.7 Synchronization

Due to asynchronicity between the main clock domain and the peripheral clock domains, some registers need to be synchronized when written or read.

The following bits and registers are write-synchronized:

Software Reset bit in Control A register (CTRLA.SWRST)
Enable bit in Control A register (CTRLA.ENABLE)

Required write synchronization is denoted by the Write-Synchronized property in the register description.

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