34.6.4.4 Sleep Mode Operation

I²C Host Operation

The generic clock (GCLK_SERCOMx_CORE) continues to run in the Idle Sleep mode. If the Run In Standby bit in the Control A register (CTRLA.RUNSTDBY) is ‘1’, the GLK_SERCOMx_CORE also runs in the Standby Sleep mode. Any interrupt can wake up the device.

If CTRLA.RUNSTDBY = 0, the GLK_SERCOMx_CORE is disabled after any ongoing transaction is finished. Any interrupt can wake up the device.

I²C Client Operation

Writing CTRLA.RUNSTDBY = 1 allows the Address Match interrupt to wake up the device.

When CTRLA.RUNSTDBY = 0, all receptions are dropped.