64GA106 datasheet(239/330 Pages) MICROCHIP

239 / 330 page

 2010 Microchip Technology Inc.

DS39905E-page 239

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

the

CVREF

Selection

bits

(CVR<3:0>), with one range offering finer resolution.

The comparator reference supply voltage can come

from either VDD and VSS, or the external VREF+ and

VREF-. 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 CVREF

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”

Section

20.

“Comparator

Voltage

Reference Module”

(DS39709).

CVR<3:0>

CVREN

CVRSS = 0

AVDD

VREF+

CVRSS = 1

CVRSS = 0

VREF-

CVRSS = 1

16 Steps

CVRR

CVREF

AVSS

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