Datasheet

PIC18F2220/2320/4220/4320

FIGURE 21-2: VOLTAGE REFERENCE OUTPUT BUFFER EXAMPLE

TABLE 21-1: REGISTERS ASSOCIATED WITH COMPARATOR VOLTAGE REFERENCE

CVREF Output

–

CVREF

Module

Voltage

Reference

Output

Impedance

(1)

RA2

Note 1: R is dependent upon the voltage reference configuration bits (CVRCON<3:0> and CVRCON<5>).

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 — CVR3 CVR2 CVR1 CVR0 000- 0000 000- 0000

CMCON C2OUT C1OUT C2INV C1INV CIS CM2 CM1 CM0 0000 0111 0000 0111

TRISA RA7

(1)

RA6

(1)

RA5 RA4 RA3 RA2 RA1 RA0 1111 1111 1111 1111

Legend: x = unknown, u = unchanged, - = unimplemented, read as ‘0’.

Shaded cells are not used with the comparator voltage reference.

Note 1: These pins are enabled based on oscillator configuration (see Configuration Register 1H).