Datasheet

PIC24F16KA102 FAMILY
DS39927C-page 188  2008-2011 Microchip Technology Inc.
REGISTER 24-1: CVRCON: COMPARATOR VOLTAGE REFERENCE CONTROL REGISTER
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
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 15-8 Unimplemented: Read as ‘0’
bit 7 CVREN: Comparator Voltage Reference Enable bit
1 =CV
REF circuit is powered on
0 =CV
REF circuit is powered down
bit 6 CVROE: Comparator VREF Output Enable bit
1 =CVREF 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 V
REF Source Selection bit
1 = Comparator reference source, CV
RSRC = VREF+ – VREF-
0 = Comparator reference source, CV
RSRC = AVDD – AVSS
bit 3-0 CVR3:CVR0: Comparator VREF Value Selection 0  CVR<3:0>  15 bits
When CVRR = 1 and CVRSS = 0:
CVREF = (CVR<3:0>/24) * (CVRSRC)
When CVRR = 0 and CVRSS = 0:
CVREF = 1/4 (CVRSRC) + (CVR<3:0>/32) * (CVRSRC)
When CVRR = 1 and CVRSS = 1:
CVREF = ((CVR<3:0>/24) * (CVRSRC)) + VREF-
When CVRR = 0 and CVRSS = 1:
CVREF = (1/4 (CVRSRC) + (CVR<3:0>/32) * (CVRSRC)) + VREF-