PIC24F04KA201 datasheet(159/224 Pages) MICROCHIP

159 / 224 page

Preliminary

DS39937B-page 157

PIC24F04KA201 FAMILY

21.0

COMPARATOR VOLTAGE

REFERENCE

21.1

Configuring the Comparator

Voltage Reference

The comparator voltage reference module is controlled

through the CVRCON register (Register 21-1). 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 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 21-1:

COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM

Note:

This data sheet summarizes the features

of this group of PIC24F devices. It is not

intended

comprehensive

reference source. For more information

on the Comparator Voltage Reference,

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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