19.2 Overview

The Voltage Reference (VREF) peripheral provides control registers for the voltage reference sources used by several peripherals. The user can select the reference voltages for the ACs by writing to the appropriate registers in the VREF peripheral.

Note: Registers within the ADC peripheral control the ADC voltage reference.

A voltage reference source is automatically enabled when requested by a peripheral. The user can enable the reference voltage sources and thus, override the automatic disabling of unused sources by writing to the ALWAYSON bit in the Analog Comparator Reference (ACREF) register. This will decrease the start-up time at the cost of increased power consumption.