31.10.3.1 Configuration Procedure

Before configuring the asynchronous partial wakeup function of a peripheral, check that the PIDx bit in PMC_PCSR is set. This ensures that the peripheral clock is enabled.

The steps to enable the asynchronous partial wakeup function of a peripheral are the following:

1. Check that the corresponding PIDx bit in the PMC SleepWalking Activity Status register (PMC_SLPWK_ASR) is set to ‘0’. This ensures that the peripheral has no activity in progress.
2. Enable the asynchronous partial wakeup function of the peripheral by writing a ‘1’ to the corresponding PIDx bit in the PMC_SLPWK_ER.
3. Check that the corresponding PIDx bit in PMC_SLPWK_ASR is set to ‘0’. This ensures that no activity has started during the enable phase.

If an activity has started during the enable phase, the asynchronous partial wakeup function must be immediately disabled by writing a ‘1’ to the PIDx bit in the PMC SleepWalking Disable register (PMC_SLPWK_DR). Wait for the end of peripheral activity before reinitializing the procedure.