PIC16F87/88
FIGURE 14-1:
COMPARATOR VOLTAGE REFERENCE BLOCK DIAGRAM
VDD
16 Stages
CVREN
R
R
R
8R
R
8R
CVRR
RA2/AN2/CVREF/VREF- pin
CVROE
CVR3
CVREF
Input to
Comparator
CVR2
CVR1
CVR0
16-1 Analog MUX
TABLE 14-1: REGISTERS ASSOCIATED WITH COMPARATOR VOLTAGE REFERENCE
Value on
all other
RESETS
Value on
POR
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
9Dh
CVRCON CVREN CVROE CVRR
CMCON
—
CVR3
CIS
CVR2
CM2
CVR1
CM1
CVR0 000- 0000 000- 0000
CM0 0000 0111 0000 0111
9Ch
C2OUT C1OUT C2INV C1INV
Legend:
x= unknown, u= unchanged, - = unimplemented, read as ‘0’.
Shaded cells are not used with the comparator voltage reference.
DS30487B-page 128
Preliminary
2003 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
