Drive the RTCC using an External 32.768 kHz Digital Clock Input
To use an external 32.768 kHz clock (digital) as an input to the RTCC, the T1OSEN bit must be set to 0 (turned off) for the RTCC to detect the external digital clock input.
To use an external 32.768 kHz clock (digital) as an input to the RTCC, the T1OSEN bit must be set to 0 (turned off) for the RTCC to detect the external digital clock input.