Microchip Technology MA240017 Data Sheet
PIC24F16KA102 FAMILY
DS39927C-page 188
2008-2011 Microchip Technology Inc.
REGISTER 24-1:
CVRCON: COMPARATOR VOLTAGE REFERENCE CONTROL REGISTER
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
CVREN
CVROE
CVRR
CVRSS
CVR3
CVR2
CVR1
CVR0
bit 7
bit 0
Legend:
R = Readable bit
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-8
Unimplemented:
Read as ‘0’
bit 7
CVREN:
Comparator Voltage Reference Enable bit
1
= CV
REF
circuit is powered on
0
= CV
REF
circuit is powered down
bit 6
CVROE:
Comparator V
REF
Output Enable bit
1
= CV
REF
voltage level is output on CV
REF
pin
0
= CV
REF
voltage level is disconnected from CV
REF
pin
bit 5
CVRR:
Comparator V
REF
Range Selection bit
1
= CV
RSRC
range should be 0 to 0.625 CV
RSRC
with CV
RSRC
/24 step size
0
= CV
RSRC
range should be 0.25 to 0.719 CV
RSRC
with CV
RSRC
/32 step size
bit 4
CVRSS:
Comparator V
REF
Source Selection bit
1
= Comparator reference source, CV
RSRC
= V
REF
+ – V
REF
-
0
= Comparator reference source, CV
RSRC
= AV
DD
– AV
SS
bit 3-0
CVR3:CVR0:
Comparator V
REF
Value Selection 0
CVR<3:0> 15 bits
When CVRR = 1 and CVRSS = 0:
CV
CV
REF
= (CVR<3:0>/24) * (CV
RSRC
)
When CVRR = 0 and CVRSS = 0:
CV
CV
REF
= 1/4 (CV
RSRC
) + (CVR<3:0>/32) * (CV
RSRC
)
When CVRR = 1 and CVRSS = 1:
CV
CV
REF
= ((CVR<3:0>/24) * (CV
RSRC
)) + V
REF
-
When CVRR = 0 and CVRSS = 1:
CV
CV
REF
= (1/4 (CV
RSRC
) + (CVR<3:0>/32) * (CV
RSRC
)) + V
REF
-