30.4.4 Sleep Mode Operation

The behavior in sleep mode depends on the host/client configuration and the Run In Standby bit in the Control A register (CTRLA.RUNSTDBY):

• Host operation with 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 with CTRLA.RUNSTDBY = 0: GLK_SERCOMx_CORE will be disabled after the ongoing transaction is finished. Any interrupt can wake up the device.
• Client operation with CTRLA.RUNSTDBY = 1: The Receive Complete interrupt can wake up the device.
• Client operation with CTRLA.RUNSTDBY = 0: All reception will be dropped, including any ongoing transaction.