Some analog peripherals require a reference voltage for proper operation.
Apart from external voltages (that is, V
DDANA or
V
REFx), the device has a DETREF module that provides two different internal
voltage references:
- BANDGAP: A stable voltage
reference, fixed at 1.1V.
- INTREF: A variable voltage
reference, configured by the Voltage References System Control register in the
Supply Controller (SUPC.VREF).
The respective reference voltage source must be selected within each
dedicated analog peripheral register: