20.3.1 Initialization
The default configuration will enable the respective source when any AC
requests a reference voltage. The default reference voltage is 1.024V but can be configured
by writing to the respective Reference Select (REFSEL) bit field in the Analog Comparators
(ACREF) register.
Note: Altering the voltage reference for one peripheral may cause undesirable noise in other peripherals dependent on the reference. Disable those peripherals during the reference change to prevent this.
