PIC24FJ128GA Datasheet, PDF (180/232 Pages) Microchip Technology – General Purpose, 16-Bit Flash Microcontrollers

PIC24FJ128GA FAMILY
REGISTER 22-1: CVRCON: COMPARATOR VOLTAGE REFERENCE CONTROL REGISTER
Upper Byte:
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
Lower Byte:
R/W-0
R/W-0
CVREN CVROE
bit 7
R/W-0
CVRR
R/W-0
CVRSS
R/W-0
CVR3
R/W-0
CVR2
R/W-0
CVR1
R/W-0
CVR0
bit 0
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 = 0 to 0.67 CVRSRC, with CVRSRC/24 step size
0 = 0.25 CVRSRC to 0.75 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
CVR3:CVR0: Comparator VREF Value Selection 0 ≤ CVR3:CVR0 ≤ 15 bits
When CVRR = 1:
CVREF = (CVR<3:0>/ 24) • (CVRSRC)
When CVRR = 0:
CVREF = 1/4 • (CVRSRC) + (CVR<3:0>/32) • (CVRSRC)
Legend:
R = Readable bit
-n = Value at Reset
W = Writable bit
‘1’ = bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = bit is cleared
x = bit is unknown
DS39747C-page 178
Preliminary
© 2006 Microchip Technology Inc.