Datasheet

 2011-2013 Microchip Technology Inc. DS70657G-page 369
dsPIC33EPXXXGP50X, dsPIC33EPXXXMC20X/50X AND PIC24EPXXXGP/MC20X
REGISTER 25-7: CVRCON: COMPARATOR VOLTAGE REFERENCE CONTROL REGISTER
U-0 R/W-0 U-0 U-0 U-0 R/W-0 U-0 U-0
—CVR2OE
(1)
— — — 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 CVR1OE
(1)
CVRR CVRSS CVR<3:0>
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 Unimplemented: Read as ‘0’
bit 14 CVR2OE: Comparator Voltage Reference 2 Output Enable bit
(1)
1 = (AVDD – AVSS)/2 is connected to the CVREF2O pin
0 = (A
VDD – AVSS)/2 is disconnected from the CVREF2O pin
bit 13-11 Unimplemented: Read as ‘0’
bit 10 VREFSEL: Comparator Voltage Reference Select bit
1 = CVREFIN = 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 CVR1OE: Comparator Voltage Reference 1 Output Enable bit
(1)
1 = Voltage level is output on the CVREF1O pin
0 = Voltage level is disconnected from then CV
REF1O pin
bit 5 CVRR: Comparator Voltage Reference Range Selection bit
1 = CVRSRC/24 step-size
0 = CV
RSRC/32 step-size
bit 4 CVRSS: Comparator Voltage Reference Source Selection bit
1 = Comparator voltage reference source, CV
RSRC = (VREF+) – (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:
CVREFIN = (CVR<3:0>/24)  (CVRSRC)
When CVRR =
0:
CVREFIN = (CVRSRC/4) + (CVR<3:0>/32)  (CVRSRC)
Note 1: CVRxOE overrides the TRISx and the ANSELx bit settings.