Datasheet

dsPIC33FJ32GP302/304, dsPIC33FJ64GPX02/X04, AND dsPIC33FJ128GPX02/X04
DS70292G-page 288 © 2007-2012 Microchip Technology Inc.
REGISTER 23-2: 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 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 15-8 Unimplemented: Read as ‘0’
bit 7 CVREN: Comparator Voltage Reference Enable bit
1 =CV
REF circuit powered on
0 =CV
REF circuit powered down
bit 6 CVROE: Comparator V
REF Output Enable bit
1 =CV
REF voltage level is output on CVREF pin
0 =CVREF voltage level is disconnected from CVREF pin
bit 5 CVRR: Comparator V
REF Range Selection bit
1 =CV
RSRC 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
bit 4 CVRSS: Comparator VREF Source Selection bit
1 = Comparator reference source CVRSRC = 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)