43.1 Overview

The Analog Comparator (AC) consists of two 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. The two comparators can combine to support a window function, discussed below.

Hysteresis is user selectable to achieve the optimal operation for each application.

By default, the input selection includes four shared analog port pins and several internal signals. The flexible internal architecture allows additional input selections. For details, refer to each chip-specific documentation. 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 one, called Comparator 0 (COMP0) and Comparator 1 (COMP1). The pair can be set in window mode to compare a signal to a voltage range instead of a single voltage level.