Datasheet

 2007-2019 Microchip Technology Inc. DS30009905F-page 241
PIC24FJ256GA110 FAMILY
23.0 COMPARATOR VOLTAGE
REFERENCE
23.1 Configuring the Comparator
Voltage Reference
The voltage reference module is controlled through the
CVRCON register (Register 23-1). 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 VSS, or the external VREF+ 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.
FIGURE 23-1: COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM
Note: 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
“Comparator Voltage Reference
Module” (www.microchip.com/DS39709)
in the “dsPIC33/PIC24 Family Reference
Manual”. The information in this data sheet
supersedes the information in the FRM.
16-to-1 MUX
CVR[3:0]
8R
R
CVREN
CVRSS = 0
AV
DD
VREF+
CVRSS = 1
8R
CVRSS = 0
V
REF-
CVRSS = 1
R
R
R
R
R
R
16 Steps
CVRR
CVREF
AVSS