PIC18F2221_1 Datasheet, PDF (251/402 Pages) Microchip Technology – Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

PIC18F2221/2321/4221/4321 FAMILY
FIGURE 22-2:
COMPARATOR VOLTAGE REFERENCE OUTPUT BUFFER EXAMPLE
PIC18FXXXX
CVREF
Module
R⁽¹⁾
Voltage
Reference
Output
Impedance
RA2
+
–
CVREF Output
Note 1: R is dependent upon the voltage reference configuration bits, CVRCON<3:0> and CVRCON<5>.
TABLE 22-1: REGISTERS ASSOCIATED WITH COMPARATOR VOLTAGE REFERENCE
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
CVRCON CVREN CVROE CVRR CVRSS CVR3 CVR2
CMCON
TRISA
C2OUT C1OUT C2INV C1INV
CIS
CM2
TRISA7⁽¹⁾ TRISA6⁽¹⁾ PORTA Data Direction Control Register
Legend: Shaded cells are not used with the comparator voltage reference.
Note 1: PORTA pins are enabled based on oscillator configuration.
CVR1
CM1
CVR0
CM0
Reset
Values
on page
57
57
58
© 2009 Microchip Technology Inc.
DS39689F-page 251