PIC24FJ128GA310 datasheet(322/406 Pages) MICROCHIP

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PIC24FJ128GA310 FAMILY

DS39996F-page 322

 2010-2011 Microchip Technology Inc.

CVRCON: COMPARATOR VOLTAGE REFERENCE CONTROL REGISTER

U-0

R/W-0

—

CVREFP

CVREFM1

CVREFM0

bit 15

bit 8

R/W-0

CVREN

CVROE

CVRR

CVRSS

CVR3

CVR2

CVR1

CVR0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 15-11

Unimplemented:

Read as ‘0’

bit 10

CVREFP:

Voltage Reference Select bit (valid only when CREF is ‘1’)

=VREF+ is used as a reference voltage to the comparators

= The CVR (4-bit DAC) within this module provides the the reference voltage to the comparators

bit 9-8

CVREFM<1:0>:

Band Gap Reference Source Select bits (valid only when CCH<1:0> = 11)

= Band gap voltage is provided as an input to the comparators

= Band gap voltage, divided by two, is provided as an input to the comparators

= Band gap voltage, divided by six, is provided as an input to the comparators

= VREF+ pin is provided as an input to the comparators

bit 7

CVREN:

Comparator Voltage Reference Enable bit

=CVREF circuit is powered on

=CVREF circuit is powered down

bit 6

CVROE:

Comparator VREF Output Enable bit

=CVREF voltage level is output on the CVREF pin

=CVREF voltage level is disconnected from the CVREF pin

bit 5

CVRR:

Comparator VREF Range Selection bit

=CVRSRC range should be 0 to 0.625 CVRSRC with CVRSRC/24 step size

=CVRSRC range should be 0.25 to 0.719 CVRSRC with CVRSRC/32 step size

bit 4

CVRSS:

Comparator VREF Source Selection bit

= Comparator reference source, CVRSRC = VREF+ – VREF-

= Comparator reference source, CVRSRC = AVDD – AVSS

bit 3-0

CVR<3:0>:

Comparator VREF Value Selection 0

 CVR<3:0>  15 bits

When CVRR = 1:

CVREF = (CVR<3:0>/24)

 (CVRSRC)

When CVRR = 0:

CVREF = 1/4

 (CVRSRC) + (CVR<3:0>/32)  (CVRSRC)

PIC24FJ128GA310 Datasheet(PDF) 322 Page - Microchip Technology

PIC24FJ128GA310 Datasheet(HTML) 322 Page - Microchip Technology

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