PIC16F87 Datasheet, PDF (130/214 Pages) Microchip Technology – 18/20/28-Pin Enhanced FLASH Microcontrollers with nanoWatt Technology

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