Datasheet
© 2008 Microchip Technology Inc. DS39631E-page 241
PIC18F2420/2520/4420/4520
FIGURE 21-2: COMPARATOR VOLTAGE REFERENCE OUTPUT BUFFER EXAMPLE
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
Reset
Values
on page
CVRCON CVREN CVROE CVRR CVRSS CVR3 CVR2 CVR1 CVR0 51
CMCON
C2OUT C1OUT C2INV C1INV CIS CM2 CM1 CM0 51
TRISA TRISA7
(1)
TRISA6
(1)
PORTA Data Direction Register 52
Legend: Shaded cells are not used with the comparator voltage reference.
Note 1: PORTA pins are enabled based on oscillator configuration.
CVREF Output
+
–
CVREF
Module
Voltage
Reference
Output
Impedance
R
(1)
RA2
Note 1: R is dependent upon the comparator voltage reference configuration bits, CVRCON<3:0> and CVRCON<5>.
PIC18FXXXX