41.5.5 Sleep Mode Operation

The Run in Standby bit in Control A register (CTRLA.RUNSTDBY bit (CTRLA <6>)) controls the behavior of the TRNG during standby sleep mode:

When this bit is '0', the TRNG is halted during sleep, but maintains its current configuration.

When this bit is '1', the TRNG continues to operate during sleep and the TRNG interrupt can be used to wake up the device from sleep modes. Events connected to the event system can trigger other operations in the system without exiting sleep modes.

References:

Sleep Mode Controller