4.14.2.2 External Pin Wake-up

:

This section applies to devices of revision D0 and later.

The device may be configured to wake from SLEEP when a valid pulse on the WAKE_IN/WAKE_IO pin, as specified by the OPEN Alliance 10BASE‑T1S Sleep/Wake‑Up Specification is detected. After receipt of a valid signal, the INH pin is driven high to the VDDAU supply to re-enable external power supplies and wake the system. See Wake-up Signal Characteristics and Timing - Rev D0 for details.

Wake-up via the WAKE_IN/WAKE_IO pin is enabled by writing a ‘1’ to the WAKE_IN Enable (WKINEN) bit in the Sleep Control 0 (SLPCTL0) register prior to entering the SLEEP state. The Wake In Polarity (WIPOL) bit in the Sleep Control 1 (SLPCTL1) register selects whether this signal is active high or low.

Note: Detection of a valid wake-up pulse on WAKE_IN or WAKE_IO after the sleep request and before the release of the INH pin will result in the sleep request being canceled. The device will remain in the active state.
Note: The WAKE_OUT pin may be disabled and combined with WAKE_IN as WAKE_IO.