PIC24FJ256DA210 Datasheet, PDF (342/408 Pages) Microchip Technology – 64/100-Pin, 16-Bit Flash Microcontrollers with Graphics Controller and USB On-The-Go (OTG)

PIC24FJ256DA210 FAMILY
REGISTER 25-1: CVRCON: COMPARATOR VOLTAGE REFERENCE CONTROL REGISTER
U-0
U-0
U-0
U-0
U-0
R/W-0
R/W-0
R/W-0
—
—
—
—
—
CVREFP CVREFM1 CVREFM0
bit 15
bit 8
R/W-0
CVREN
bit 7
R/W-0
CVROE
R/W-0
CVRR
R/W-0
CVRSS
R/W-0
CVR3
R/W-0
CVR2
R/W-0
CVR1
R/W-0
CVR0
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-11
bit 10
bit 9-8
bit 7
bit 6
bit 5
bit 4
bit 3-0
Unimplemented: Read as ‘0’
CVREFP: Voltage Reference Select bit (valid only when CREF is ‘1’)
1 = VREF+ is used as a reference voltage to the comparators
0 = The CVR (4-bit DAC) within this module provides the the reference voltage to the comparators
CVREFM<1:0>: 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 = Band gap voltage divided-by-two is provided as an input to the comparators
10 = Band gap voltage divided-by-six is provided as an input to the comparators
11 = VREF+ pin is provided as an input the comparators
CVREN: Comparator Voltage Reference Enable bit
1 = CVREF circuit is powered on
0 = CVREF circuit is powered down
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
CVRR: Comparator VREF Range Selection bit
1 = CVRSRC range should be 0 to 0.625 CVRSRC with CVRSRC/24 step size
0 = CVRSRC range should be 0.25 to 0.719 CVRSRC with CVRSRC/32 step size
CVRSS: Comparator VREF Source Selection bit
1 = Comparator reference source CVRSRC = VREF+ – VREF-
0 = Comparator reference source CVRSRC = AVDD – AVSS
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)
DS39969B-page 342
 2010 Microchip Technology Inc.