PIC18F23K20-E/MLQTP MICROCHIP [Microchip Technology], PIC18F23K20-E/MLQTP Datasheet - Page 283

• Manufacturer Part Number: PIC18F23K20-E/MLQTP
• Description: 28/40/44-Pin Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology
• Manufacturer: MICROCHIP [Microchip Technology]

FIGURE 21-2:
REGISTER 21-1:
© 2007 Microchip Technology Inc.
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7
bit 6
bit 5
bit 4
bit 3-0
Note 1:
CVREN
R/W-0
Note 1:
CVROE overrides the TRISA<2> bit setting.
CVREN: Comparator Voltage Reference Enable bit
1 = CV
0 = CV
CVROE: Comparator V
1 = CV
0 = CV
CVRR: Comparator V
1 = 0 to 0.667 CV
0 = 0.25 CV
CVRSS: Comparator V
1 = Comparator reference source, CV
0 = Comparator reference source, CV
CVR<3:0>: Comparator V
When CVRR = 1:
CV
When CVRR = 0:
CV
CVROE
PIC18F2XK20/4XK20
R is dependent upon the voltage reference Configuration bits, CVR<3:0> and CVRR.
REF
REF
CV
Module
R/W-0
REF
VOLTAGE REFERENCE OUTPUT BUFFER EXAMPLE
CVRCON: COMPARATOR VOLTAGE REFERENCE CONTROL REGISTER
= ((CVR<3:0>)/24) • (CV
= (CV
REF
REF
REF
REF
(1)
circuit powered on
circuit powered down
voltage level is also output on the CV
voltage is disconnected from the CV
RSRC
RSRC
Impedance
Reference
W = Writable bit
‘1’ = Bit is set
Voltage
Output
R
R/W-0
CVRR
RSRC
/4) + ((CVR<3:0>)/32) • (CV
to 0.75 CV
(1)
REF
REF
REF
, with CV
Range Selection bit
REF
CV
Source Selection bit
Output Enable bit
Advance Information
RSRC
REF
Value Selection bits (0 ≤ (CVR<3:0>) ≤ 15)
CVRSS
RSRC
RSRC
R/W-0
, with CV
)
/24 step size (low range)
RSRC
RSRC
RSRC
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
= (V
= V
(1)
RSRC
R/W-0
CVR3
PIC18F2XK20/4XK20
DD
REF
/32 step size (high range)
REF
REF
– V
)
+) – (V
pin
pin
SS
+
–
REF
R/W-0
CVR2
-)
Buffered CV
x = Bit is unknown
R/W-0
CVR1
REF
DS41303B-page 281
Output
R/W-0
CVR0
bit 0