PIC18F2450/4450
DS39760A-page 100
Advance Information
2006 Microchip Technology Inc.
TABLE 9-1:
PORTA I/O SUMMARY
TABLE 9-2:
SUMMARY OF REGISTERS ASSOCIATED WITH PORTA
Pin
Function
TRIS
Setting
I/O
I/O Type
Description
RA0/AN0
RA0
0
OUT
DIG
LATA<0> data output; not affected by analog input.
1
IN
TTL
PORTA<0> data input; disabled when analog input enabled.
AN0
1
IN
ANA
A/D input channel 0. Default configuration on POR; does not affect
digital output.
RA1/AN1
RA1
0
OUT
DIG
LATA<1> data output; not affected by analog input.
1
IN
TTL
PORTA<1> data input; reads ‘0’ on POR.
AN1
1
IN
ANA
A/D input channel 1. Default configuration on POR; does not affect
digital output.
RA2/AN2/
VREF-
RA2
0
OUT
DIG
LATA<2> data output; not affected by analog input.
1
IN
TTL
PORTA<2> data input. Disabled when analog functions enabled.
AN2
1
IN
ANA
A/D input channel 2. Default configuration on POR; not affected by
analog output.
VREF-
1
IN
ANA
A/D voltage reference low input.
RA3/AN3/
VREF+
RA3
0
OUT
DIG
LATA<3> data output; not affected by analog input.
1
IN
TTL
PORTA<3> data input; disabled when analog input enabled.
AN3
1
IN
ANA
A/D input channel 3. Default configuration on POR.
VREF+
1
IN
ANA
A/D voltage reference high input.
RA4/T0CKI/
RCV
RA4
0
OUT
DIG
LATA<4> data output; not affected by analog input.
1
IN
ST
PORTA<4> data input; disabled when analog input enabled.
T0CKI
1
IN
ST
Timer0 clock input.
RCV
x
IN
TTL
External USB transceiver RCV input.
RA5/AN4/
HLVDIN
RA5
0
OUT
DIG
LATA<5> data output; not affected by analog input.
1
IN
TTL
PORTA<5> data input; disabled when analog input enabled.
AN4
1
IN
ANA
A/D input channel 4. Default configuration on POR.
HLVDIN
1
IN
ANA
High/Low-Voltage Detect external trip point input.
OSC2/CLKO/
RA6
OSC2
x
OUT
ANA
Main oscillator feedback output connection (all XT and HS modes).
CLKO
x
OUT
DIG
System cycle clock output (FOSC/4); available in EC, ECPLL and
INTCKO modes.
RA6
0
OUT
DIG
LATA<6> data output. Available only in ECIO, ECPIO and INTIO
modes; otherwise, reads as ‘0’.
1
IN
TTL
PORTA<6> data input. Available only in ECIO, ECPIO and INTIO
modes; otherwise, reads as ‘0’.
Legend:
OUT = Output, IN = Input, ANA = Analog Signal, DIG = Digital Output, ST = Schmitt Buffer Input,
TTL = TTL Buffer Input, x = Don’t care (TRIS bit does not affect port direction or is overridden for this option)
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Reset
Values
on page
PORTA
—RA6(1)
RA5
RA4
RA3
RA2
RA1
RA0
LATA
—LATA6(1)
LATA5
LATA4
LATA3
LATA2
LATA1
LATA0
TRISA
TRISA6(1)
TRISA5
TRISA4
TRISA3
TRISA2
TRISA1
TRISA0
ADCON1
VCFG1
VCFG0
PCFG3
PCFG2
PCFG1
PCFG0
UCON
PPBRST
SE0
PKTDIS
USBEN
RESUME SUSPND
Legend: — = unimplemented, read as ‘0’. Shaded cells are not used by PORTA.
Note 1:
RA6 and its associated latch and data direction bits are enabled as I/O pins based on oscillator
configuration; otherwise, they are read as ‘0’.
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