Datasheet

 2010-2013 Microchip Technology Inc. DS39881E-page 207
PIC24FJ64GA004 FAMILY
23.0 COMPARATOR VOLTAGE
REFERENCE
23.1 Configuring the Comparator
Voltage Reference
The comparator 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 CVREF 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
the “PIC24F Family Reference Manual”,
“Comparator Voltage Reference
Module” (DS39709).
16-to-1 MUX
CVR<3:0>
8R
R
CVREN
CVRSS = 0
AVDD
VREF+
CVRSS = 1
8R
CVRSS = 0
V
REF-
CVRSS = 1
R
R
R
R
R
R
16 Steps
CVRR
CVREF
AVSS