Datasheet

dsPIC33EPXXXGM3XX/6XX/7XX
DS70000689D-page 380  2013-2014 Microchip Technology Inc.
REGISTER 26-7: CVR1CON: COMPARATOR VOLTAGE REFERENCE CONTROL REGISTER 1
U-0 U-0 U-0 U-0 R/W-0 R/W-0 U-0 U-0
— — — — CVRR1 VREFSEL — —
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 CVRR0 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 15-12 Unimplemented: Read as ‘0’
bit 11 CVRR1: Comparator Voltage Reference Range Selection bit
See bit 5.
bit 10 VREFSEL: Voltage Reference Select bit
1 = CV
REFIN = VREF+
0 = CV
REFIN is generated by the resistor network
bit 9-8 Unimplemented: Read as ‘0’
bit 7 CVREN: Comparator Voltage Reference Enable bit
1 = Comparator voltage reference circuit is powered on
0 = Comparator voltage reference circuit is powered down
bit 6 CVROE: Comparator Voltage Reference Output Enable on CV
REF1O Pin bit
1 = Voltage level is output on the CV
REF1O pin
0 = Voltage level is disconnected from the CV
REF1O pin
bit 11, 5 CVRR<1:0>: Comparator Voltage Reference Range Selection bits
11 = 0.00 CVRSRC to 0.94, with CVRSRC/16 step-size
10 = 0.33 CV
RSRC to 0.96, with CVRSRC/24 step-size
01 = 0.00 CV
RSRC to 0.67, with CVRSRC/24 step-size
00 = 0.25 CV
RSRC to 0.75, with CVRSRC/32 step-size
bit 4 CVRSS: Comparator Voltage Reference Source Selection bit
1 = Comparator voltage reference source, CV
RSRC = CVREF+ – AVSS
0 = Comparator voltage reference source, CV
RSRC = AVDD – AVSS
bit 3-0 CVR<3:0> Comparator Voltage Reference Value Selection 0  CVR<3:0>  15 bits
When CVRR<1:0> =
11:
CVREF = (CVR<3:0>/16)  (CVRSRC)
When CVRR<1:0> =
10:
CVREF = (1/3)  (CVRSRC) + (CVR<3:0>/24)  (CVRSRC)
When CVRR<1:0> =
01:
CVREF = (CVR<3:0>/24)  (CVRSRC)
When CVRR<1:0> =
00:
CVREF = (1/4)  (CVRSRC) + (CVR<3:0>/32)  (CVRSRC)