The behavior in Sleep mode is depending on the host/client configuration and
the Run In Standby bit in the Control A register (CTRLA.RUNSTDBY):
- Host operation, CTRLA.RUNSTDBY=1: The
peripheral clock GCLK_SERCOM_CORE will continue to run in idle sleep mode and in Standby
Sleep mode. Any interrupt can wake up the device.
- Host operation, CTRLA.RUNSTDBY=0:
GLK_SERCOMx_CORE will be disabled after the ongoing transaction is finished. Any
interrupt can wake up the device.
- Client operation, CTRLA.RUNSTDBY=1: The
Receive Complete interrupt can wake up the device.
- Client operation, CTRLA.RUNSTDBY=0: All
reception will be dropped, including the ongoing transaction.