29.3.5 Sleep Mode Operation
In Idle sleep mode the AC will continue to operate normal. in all sleep modes in which CLK_PER is available.
In Standby sleep mode, the AC is disabled by default. If the Run in Standby Sleep Mode bit (RUNSTDBY) in the Control A register (AC.CTRLA) is written to '1', the AC will continue to operate, but the Status register will not be updated, and no Interrupts are generated , but events and the pad output will be updated.
In Power Down sleep mode, the AC and the output to pad are disabled.