PIC18F2480/2580/4480/4580
TABLE 11-1: PORTA I/O SUMMARY
Pin Name
Function
I/O
TRIS
Buffer
Description
RA0/AN0/CVREF
RA0
OUT
IN
0
1
1
DIG
TTL
LATA<0> data output.
PORTA<0> data input.
AN0
IN
ANA A/D Input Channel 0. Enabled on POR; this analog input overrides the
digital input (read as clear – low level).
(1)
CVREF
OUT
x
ANA Comparator voltage reference analog output. Enabling this analog
output overrides the digital I/O (read as clear – low level).
RA1/AN1
RA1
OUT
IN
0
1
1
DIG
TTL
LATA<1> data output.
PORTA<1> data input.
AN1
RA2
IN
ANA A/D Input Channel 1. Enabled on POR; this analog input overrides the
digital input (read as clear – low level).
RA2/AN2/VREF-
OUT
IN
0
1
1
DIG
TTL
LATA<2> data output.
PORTA<2> data input.
AN2
IN
ANA A/D Input Channel 2. Enabled on POR; this analog input overrides the
digital input (read as clear – low level).
VREF-
RA3
IN
OUT
IN
1
0
1
1
ANA A/D and comparator negative voltage analog input.
RA3/AN3/VREF+
DIG
TTL
LATA<3> data output.
PORTA<3> data input.
AN3
IN
ANA A/D Input Channel 3. Enabled on POR; this analog input overrides the
digital input (read as clear – low level).
VREF+
RA4
IN
OUT
IN
1
0
1
1
0
1
1
ANA A/D and comparator positive voltage analog input.
RA4/T0CKI
DIG
TTL
ST
LATA<4> data output.
PORTA<4> data input.
Timer0 clock input.
T0CKI
RA5
IN
RA5/AN4/SS/HLVDIN
OUT
IN
DIG
TTL
LATA<5> data output.
PORTA<5> data input.
AN4
IN
ANA A/D Input Channel 4. Enabled on POR; this analog input overrides the
digital input (read as clear – low level).
SS
IN
IN
1
1
x
TTL
Slave select input for MSSP.
HLVDIN
OSC2
ANA High/Low-Voltage Detect external trip point input.
OSC2/CLKO/RA6
OSC1/CLKI/RA7
OUT
ANA Output connection; selected by FOSC<3:0> Configuration bits.
Enabling OSC2 overrides digital I/O.
CLKO
RA6
OUT
x
DIG
Output connection; selected by FOSC<3:0> Configuration bits.
Enabling CLKO overrides digital I/O (FOSC/4).
OUT
IN
0
1
x
DIG
TTL
LATA<6> data output.
PORTA<6> data input.
OSC1
CLKI
RA7
IN
ANA Main oscillator input connection determined by FOSC<3:0>
Configuration bits. Enabling OSC1 overrides digital I/O.
IN
x
ANA Main clock input connection determined by FOSC<3:0>
Configuration bits. Enabling CLKI overrides digital I/O.
OUT
IN
0
1
DIG
TTL
LATA<7> data output.
PORTA<7> data input.
Legend:
OUT = Output, IN = Input, ANA = Analog Signal, DIG = Digital Output, ST = Schmitt Buffer Input, TTL = TTL Buffer Input
Note 1: Available on 40/44-pin devices only.
DS39637D-page 136
© 2009 Microchip Technology Inc.
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