# Sleep Mode Operation

Writing the Run In Standby (RUNSTDBY) bit in the CCL.CTRLA register to ‘1’ will allow the selected clock source to be enabled in Standby sleep mode.

If RUNSTDBY is ‘0’, the peripheral clock will be disabled in Standby sleep mode. If the filter, edge detector, and/or sequencer are enabled, the LUT output will be forced to ‘0’ in Standby sleep mode. In Idle sleep mode, the truth table decoder will continue the operation, and the LUT output will be refreshed accordingly, regardless of the RUNSTDBY bit.

If the CLKSRC bit in the CCL.LUTnCTRLA register is written to ‘1’, the LUTn-TRUTHSEL[2] will always clock the filter, edge detector, and Sequencer block. The availability of the LUTn-TRUTHSEL[2] clock in sleep modes will depend on the sleep settings of the peripheral used.