Atmel Xplained Pro Evaluation Kit ATSAMD20-XPRO ATSAMD20-XPRO Data Sheet

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Atmel | SMART SAM D20 [DATASHEET]

Atmel-42129K–SAM-D20_datasheet–06/2014

Writing a one to this bit resets all registers in the SERCOM, except DBGCTRL, to their initial state, and the SER-
COM will be disabled. 

Writing a one to CTRLA.SWRST will always take precedence, meaning that all other writes in the same write-oper-
ation will be discarded. 

Due to synchronization, there is a delay from writing CTRLA.SWRST until the reset is complete. CTRLA.SWRST 
and STATUS.SYNCBUSY will both be cleared when the reset is complete.

This bit is not enable-protected.