Microchip Technology AC164139 Data Sheet

 2010 Microchip Technology Inc.

DS39969B-page 341

The voltage reference module is controlled through the
CVRCON register (Register 25-1). 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 reference
source. For more information, refer to the
“PIC24F Family Reference Manual”,
Section 19. “Comparator Module”
(DS39710). The information in this data
sheet supersedes the information in the
FRM.

16

-t

o-

1 M

U

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

CVROE

C

VREF

Pin