PIC16F87_05 Datasheet, PDF (130/228 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⁽¹⁾
CVREF
Input to
Comparator
CVROE
16-to-1 Analog MUX
Note 1: VREF is available on the PIC16F88 device only.
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
CVRCON CVREN CVROE CVRR — CVR3 CVR2 CVR1 CVR0 000- 0000 000- 0000
9Ch
CMCON C2OUT C1OUT C2INV C1INV CIS
CM2 CM1 CM0 0000 0111 0000 0111
Legend: x = unknown, u = unchanged, - = unimplemented, read as ‘0’. Shaded cells are not used with the comparator voltage reference.
DS30487C-page 128
 2005 Microchip Technology Inc.