32.6.6 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 are synchronized when written:
- Software Reset bit in the CTRLA register (CTRLA.SWRST)
- Enable bit in the CTRLA register (CTRLA.ENABLE)
- Receiver Enable bit in the CTRLB register (CTRLB.RXEN)
- Transmitter Enable bit in the Control B register (CTRLB.TXEN)
Note: CTRLB.RXEN is write-synchronized somewhat differently. See the CTRLB register from Related Links.
Required write synchronization is denoted by the Write-Synchronized property in the register description.