Wake SAMD21 from sleep on Serial(UART)


I was wondering if it is possible to wake the SAMD21 from sleep if an activity is detected on the Serial pins (UART).

Also, how do I keep the Serial ports active during sleep?

I have interfaced the Adafruit fingerprint sensor with the SAMD21 and would like to wakeup the MCU after authentication on the fingerprint module side.

Thanks in advance!