PIC18F2420/2520/4420/4520
FIGURE 21-2:
COMPARATOR VOLTAGE REFERENCE OUTPUT BUFFER EXAMPLE
PIC18FXXXX
CVREF
Module
(1)
R
+
–
CVREF Output
RA2
Voltage
Reference
Output
Impedance
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
Reset
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Values
on page
CVRCON
CMCON
TRISA
CVREN
C2OUT
CVROE
C1OUT
CVRR
C2INV
CVRSS
C1INV
CVR3
CIS
CVR2
CM2
CVR1
CM1
CVR0
CM0
51
51
52
TRISA7(1) TRISA6(1) PORTA Data Direction Register
Legend: Shaded cells are not used with the comparator voltage reference.
Note 1: PORTA pins are enabled based on oscillator configuration.
© 2008 Microchip Technology Inc.
DS39631E-page 241
MICROCHIP [ MICROCHIP ]
