40.1 Overview

The Analog Comparator (AC) supports multiple individual comparators. Each comparator (COMP) compares the voltage levels on two inputs, and provides a digital output based on this comparison. Each comparator may be configured to generate interrupt requests and/or peripheral events upon several different combinations of input change.

Hysteresis and propagation delay can be adjusted to achieve optimal operation for each application.

The input selection includes four shared analog port pins (only two, AIN[5:4], for CMP2 and CMP3 on E and G variants) and several internal signals. Each Comparator Output state can also be output on a pin for use by external devices.

The comparators are grouped in pairs on each port. The AC peripheral implements two pairs of comparators . These are called Comparator 0 (COMP0) and Comparator 1 (COMP1) for the first pair and Comparator 2 (COMP2) and Comparator 3 (COMP3) for the second pair. They have identical behaviors, but separate Control registers. Each pair can be set in Window mode to compare a signal to a voltage range instead of a single voltage level.