Microchip Technology MA240017 Data Sheet

 2008-2011 Microchip Technology Inc.

DS39927C-page 187

The comparator voltage reference module is controlled
through the CVRCON register (

). The

comparator voltage reference provides two ranges of
output voltage, each with 16 distinct levels. The range
to be used is selected by the CVRR bit (CVRCON<5>).
The primary difference between the ranges is the size
of the steps selected by the CV

REF

 Selection bits

(CVR<3:0>), with one range offering finer resolution.
The comparator reference supply voltage can come
from either V

DD

 and V

SS

, or the external V

REF

+ and

V

REF

-. The voltage source is selected by the CVRSS bit

(CVRCON<4>).
The settling time of the comparator voltage reference
must be considered when changing the CV

REF

output.

This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive refer-
ence source. For more information on the
Comparator Voltage Reference, refer to
the  “PIC24F Family Reference Manual”,
Section 20. “Comparator Voltage
Reference Module”

 (DS39709).

16

-to

-1 MU

X

CVR<3:0>

8R

R

CVREN

CVRSS = 0

AV

DD

V

REF

+

CVRSS = 1 

8R

CVRSS = 0

V

REF

-

CVRSS = 1 

R

R

R

R

R

R

16 Steps

CVRR

CV

REF

AV

SS