13.4.3 Sleep Mode Exit

Unless the Two-Speed Start-up is enabled, there are no clock-switching events when exiting the Sleep mode. With Two-Speed Start-up disabled, the Sleep mode is effectively extended until the selected clock is ready. Once the clock is ready, the device enters the RUN mode.

If Two-Speed Start-up is enabled, the device will come out of Sleep running with the FRC as the clock source and perform an automatic clock switch to the selected clock source.

If Two-Speed Start-up is enabled, the RUN mode is entered immediately using the Two-Speed Start-up clock source. A clock switch to the selected clock source occurs once the source is ready.

Note: Two-Speed Start-up is not permanently enabled and is software programmable.