D301 datasheet(316/416 Pages) MICROCHIP

316 / 416 page

PIC24FJ256GA705 FAMILY

DS30010118D-page 316

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CVRCON: COMPARATOR VOLTAGE REFERENCE CONTROL REGISTER

U-0

R/W-0

—

CVREFP

CVREFM1

CVREFM0

bit 15

bit 8

R/W-0

CVREN

CVROE

CVRSS

CVR4

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

1 = CVREF+ is used as a reference voltage to the comparators

0 = The CVR<4:0> bits (5-bit DAC) within this module provide the reference voltage to the comparators

bit 9-8

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

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

01 = Reserved

10 = Reserved

11 = CVREF+ is provided as an input to the comparators

bit 7

CVREN: Comparator Voltage Reference Enable bit

1 = CVREF circuit is powered on

0 = CVREF circuit is powered down

bit 6

CVROE: Comparator VREF Output Enable bit

1 = CVREF voltage level is output on the CVREF pin

0 = CVREF voltage level is disconnected from the CVREF pin

bit 5

CVRSS: Comparator VREF Source Selection bit

1 = Comparator reference source, CVRSRC = CVREF+ – CVREF-

0 = Comparator reference source, CVRSRC = AVDD – AVSS

bit 4-0

CVR<4:0>: Comparator VREF Value Selection bits (0

 CVR<4:0>  31)

When CVRSS = 1:

CVREF = (CVREF-) + (CVR<4:0>/32)

 (CVREF+ – CVREF-)

When CVRSS = 0:

CVREF = (AVSS) + (CVR<4:0>/32)

 (AVDD – AVSS)

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