Microchip Technology DM183037 Data Sheet

 2012 Microchip Technology Inc.

DS30575A-page 489

The analog comparator module contains three compar-
ators that can be independently configured in a variety
of ways. The inputs can be selected from the analog
inputs and two internal voltage references. The digital
outputs are available at the pin level, via PPS-Lite, and
can also be read through the control register. Multiple
output and interrupt event generations are also avail-
able. A generic single comparator from the module is
shown in 

.

Key features of the module includes:
• Independent comparator control
• Programmable input configuration
• Output to both pin and register levels
• Programmable output polarity
• Independent interrupt generation for each 

comparator with configurable interrupt-on-change

The CMxCON registers (CM1CON, CM2CON and
CM3CON) select the input and output configuration for
each comparator, as well as the settings for interrupt
generation (see 

).

The CMSTAT register (

) provides the out-

put results of the comparators. The bits in this register
are read-only. 

Cx

V

IN

-

V

IN

+

COE

CxOUT

0

1

2

0

1

CCH<1:0>

CxINB

CxINC

C2INB/C2IND

CxINA

CV

REF

CON

Interrupt

Logic

EVPOL<1:0>

CxOUT
(CMSTAT<2:0>)

CMPxIF

CPOL

Polarity

Logic

CREF

3

V

BG

Note 1: Comparator 1 and Comparator 3 use C2INB as an input to the inverted terminal. Comparator 2 uses C2IND as an

input to the inverted terminal.