4.15.4.2 Bypassing the 32.768 kHz Crystal Oscillator

The sequence to bypass the 32.768 kHz crystal oscillator is the following:

1. An external clock must be connected on XIN32.
2. Enable the bypass path by writing a 1 to the OSC32BYP bit.
3. Disable the 32.768 kHz crystal oscillator by writing a 0 to the OSC32EN bit.