Microchip Technology MA330019 데이터 시트
dsPIC33FJ32MC302/304, dsPIC33FJ64MCX02/X04 AND dsPIC33FJ128MCX02/X04
DS70291G-page 308
© 2007-2012 Microchip Technology Inc.
REGISTER 24-2:
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
CVR<3:0>
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
1 = CV
REF
circuit powered on
0 = CV
REF
circuit 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
CVR<3:0>: Comparator V
REF
Value Selection 0
≤ CVR<3:0> ≤ 15 bits
When CVRR = 1:
CV
CV
REF
= (CVR<3:0>/ 24)
• (CV
RSRC
)
When CVRR = 0:
CV
CV
REF
= 1/4
• (CV
RSRC
) + (CVR<3:0>/32)
• (CV
RSRC
)