13.11.6.4 Output Pins
The SUPC can drive two outputs. By writing a '1' to the corresponding Output Enable bit in the Backup Output Control register (BKOUT.EN), the OUTx pin is driven by the SUPC.
The OUT pin can be set by writing a '1' to the corresponding Set Output bit in the Backup Output Control register (BKOUT.SETx).
The OUT pin can be cleared by writing a '1' to the corresponding CLR bit (BKOUT.CLRx).
If a RTC Toggle Enable bit is written to '1' (BKOUT.RTCTGLx), the corresponding OUTx pin will toggle when an RTC event occurs.