70291E Datasheet, PDF (297/436 Pages) Microchip Technology – High-Performance, 16-bit Digital Signal Controllers

dsPIC33FJ32MC302/304, dsPIC33FJ64MCX02/X04 AND dsPIC33FJ128MCX02/X04
REGISTER 24-2: CVRCON: COMPARATOR VOLTAGE REFERENCE CONTROL REGISTER
U-0
—
bit 15
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
U-0
U-0
—
—
bit 8
R/W-0
CVREN
bit 7
R/W-0
CVROE
R/W-0
CVRR
R/W-0
CVRSS
R/W-0
R/W-0
R/W-0
CVR<3:0>
R/W-0
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-8
bit 7
bit 6
bit 5
bit 4
bit 3-0
Unimplemented: Read as ‘0’
CVREN: Comparator Voltage Reference Enable bit
1 = CVREF circuit powered on
0 = CVREF circuit powered down
CVROE: Comparator VREF Output Enable bit
1 = CVREF voltage level is output on CVREF pin
0 = CVREF voltage level is disconnected from CVREF pin
CVRR: Comparator VREF Range Selection bit
1 = CVRSRC 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
CVRSS: Comparator VREF Source Selection bit
1 = Comparator reference source CVRSRC = VREF+ – VREF-
0 = Comparator reference source CVRSRC = AVDD – AVSS
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)
© 2011 Microchip Technology Inc.
DS70291E-page 297