PIC18F2220 Datasheet, PDF(231/388 Page) Microchip Technology – 28/40/44-Pin High-Performance, Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

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PIC18F2220 Datasheet, PDF (231/388 Pages) Microchip Technology – 28/40/44-Pin High-Performance, Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

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PIC18F2220/2320/4220/4320

FIGURE 21-2:

VOLTAGE REFERENCE OUTPUT BUFFER EXAMPLE

CVREF

R(1)

Module

Voltage

Reference

Output

Impedance

RA2

+

â

CVREF Output

Note 1: R is dependent upon the 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 â CVR3 CVR2 CVR1 CVR0 000- 0000 000- 0000

CMCON C2OUT C1OUT C2INV C1INV

TRISA

RA7(1) RA6(1) RA5 RA4

CIS

RA3

CM2

RA2

CM1

RA1

CM0 0000 0111 0000 0111

RA0 1111 1111 1111 1111

Legend: x = unknown, u = unchanged, - = unimplemented, read as â0â.

Shaded cells are not used with the comparator voltage reference.

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

ï£© 2003 Microchip Technology Inc.

DS39599C-page 229

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