33.6.5 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, CTRLA.RUNSTDBY = 1 – The peripheral clock GCLK_SERCOMx_CORE continues to run in Idle Sleep mode and in Standby Sleep mode. Any interrupt can wake up the device.
• Host operation, CTRLA.RUNSTDBY = 0 – GCLK_SERCOMx_CORE is 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 is dropped, including the ongoing transaction.