18.6.4.1 SleepWalking

SleepWalking is the capability for a device to temporarily wake up clocks for a peripheral to perform a task without waking up the CPU from STANDBY sleep mode. At the end of the sleepwalking task, the device can either be woken p by an interrupt (from a peripheral involved in SleepWalking) or enter again into STANDBY sleep mode. In this device, SleepWalking is supported only on GCLK clocks by using the on-demand clock principle of the clock sources.

In standby, when SleepWalking is ongoing:

• All the power domains are turned ON including PDRAM power domain.
• The MAINVREG regulator used to execute the sleepwalking task is the selected regulator used in active mode (LDO or Buck converter). Low power mode of the MAINVREG is not activated during sleepwalking.

These are illustrated in the figure below.