PIC18F6520-I Datasheet, PDF (233/380 Pages) Micrel Semiconductor – 64/80-Pin High-Performance, 256 Kbit to 1 Mbit Enhanced Flash Microcontrollers with A/D

PIC18F6520/8520/6620/8620/6720/8720
FIGURE 21-2:
VOLTAGE REFERENCE OUTPUT BUFFER EXAMPLE
CVREF
Module
R⁽¹⁾
RF5
Voltage
Reference
Output
Impedance
+
–
CVREF Output
Note 1: R is dependent upon the Comparator Voltage Reference Configuration bits CVRCON<3:0> and CVRCON<5>.
TABLE 21-1: REGISTERS ASSOCIATED WITH COMPARATOR VOLTAGE REFERENCE
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
CVRCON CVREN CVROE CVRR CVRSS CVR3 CVR2 CVR1
CMCON C2OUT C1OUT C2INV C1INV CIS
CM2 CM1
TRISF TRISF7 TRISF6 TRISF5 TRISF4 TRISF3 TRISF2 TRISF1
Legend: x = unknown, u = unchanged, – = unimplemented, read as ‘0’.
Shaded cells are not used with the comparator voltage reference.
CVR0
CM0
TRISF0
0000 0000 0000 0000
0000 0000 0000 0000
1111 1111 1111 1111
 2004 Microchip Technology Inc.
DS39609B-page 231