Datasheet

PIC24FJ64GA104 FAMILY
DS39951C-page 234  2010 Microchip Technology Inc.
REGISTER 23-1: 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 R/W -0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 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: C
VREF+ Reference Output Select bit
1 =Use V
REF+ input pin as CVREF+ reference output to comparators
0 = Use comparator voltage reference module’s generated output as C
VREF+ reference output to
comparators
bit 9-8 CVREFM<1:0>: CV
REF- Reference Output Select bits
11 =Use VREF+ input pin as CVREF- reference output to comparators
10 =Use V
BG/6 as CVREF- reference output to comparators
01 =Use V
BG as CVREF- reference output to comparators
00 =Use V
BG/2 as CVREF- reference output to comparators
bit 7 CVREN: Comparator Voltage Reference Enable bit
1 =CVREF circuit is powered on
0 =CV
REF circuit is powered down
bit 6 CVROE: Comparator V
REF Output Enable bit
1 =CV
REF voltage level is output on CVREF pin
0 =CV
REF voltage level is disconnected from CVREF pin
bit 5 CVRR: Comparator VREF Range Selection bit
1 =CVRSRC range should be 0 to 0.625 CVRSRC with CVRSRC/24 step size
0 =CV
RSRC range should be 0.25 to 0.719 CVRSRC with CVRSRC/32 step size
bit 4 CVRSS: Comparator VREF Source Selection bit
1 = Comparator reference source, CV
RSRC = VREF+ – VREF-
0 = Comparator reference source, CV
RSRC = 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)