PIC24FJ16MC101_12 Datasheet, PDF (217/350 Pages) Microchip Technology – 16-bit Microcontrollers (up to 32 KB Flash and 2 KB SRAM)

PIC24FJ16MC101/102 AND PIC24FJ32MC101/102/104
REGISTER 20-6: 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
R/W-0
R/W-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
CVREN
CVROE⁽¹⁾
CVRR
—
CVR<3:0>
bit 7
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 = CVREF pin
0 = CVREFIN is generated by the resistor network
BGSEL<1:0>: Band Gap Reference Source Select bits
11 = INTREF = CVREF pin
10 = INTREF = 1.2V (nominal)⁽²⁾
0x = Reserved
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
Unimplemented: Read as ‘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 = 1/4 • (CVRSRC) + (CVR<3:0>/32) • (CVRSRC)
Note 1: CVROE overrides the TRIS bit setting.
2: This reference voltage is generated internally on the device. Refer to Section 26.0 “Electrical
Characteristics” for the specified voltage range.
© 2011-2012 Microchip Technology Inc.
Preliminary
DS39997C-page 217