PIC24EP256GU810-I Datasheet, PDF (448/622 Pages) Electronic Film Capacitors, Inc. – 16-Bit Microcontrollers and Digital Signal Controllers with High-Speed PWM, USB and Advanced Analog

dsPIC33EPXXX(GP/MC/MU)806/810/814 and PIC24EPXXX(GP/GU)810/814
REGISTER 25-6: CVRCON: COMPARATOR VOLTAGE REFERENCE CONTROL REGISTER
U-0
—
bit 15
U-0
U-0
U-0
U-0
R/W-0
R/W-0
R/W-0
—
—
—
—
VREFSEL
BGSEL<1:0>
bit 8
R/W-0
CVREN
bit 7
R/W-0
CVROE⁽¹⁾
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 15-11
bit 10
bit 9-8
bit 7
bit 6
bit 5
bit 4
bit 3-0
Unimplemented: Read as ‘0’
VREFSEL: Voltage Reference Select bit
1 = CVREFIN = VREF+
0 = CVREFIN is generated by the resistor network
BGSEL<1:0>: Band Gap Reference Source Select bits
11 = IVREF = VREF+⁽²⁾
10 = IVREF = 0.20V (nominal)
01 = IVREF = 0.60V (nominal)
00 = IVREF = 2.20V (nominal)
CVREN: Comparator Voltage Reference Enable bit
1 = Comparator voltage reference circuit powered on
0 = Comparator voltage reference circuit powered down
CVROE: Comparator Voltage Reference Output Enable bit⁽¹⁾
1 = Voltage level is output on CVREF pin
0 = Voltage level is disconnected from CVREF pin
CVRR: Comparator Voltage Reference Range Selection bit
1 = CVRSRC/24 step-size
0 = CVRSRC/32 step-size
CVRSS: Comparator Voltage Reference Source Selection bit
1 = Comparator voltage reference source, CVRSRC = (VREF+) – (VREF-)⁽²⁾
0 = Comparator voltage reference source, CVRSRC = AVDD – AVSS
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 = 1/4 • (CVRSRC) + (CVR<3:0>/32) • (CVRSRC)
Note 1: CVROE overrides the TRIS bit setting.
2: Selecting BGSEL<1:0> = 11 and CVRSS = 1 is invalid and will produce unpredictable results.
DS70616G-page 448
 2009-2012 Microchip Technology Inc.