Datasheet

© 2009 Microchip Technology Inc. DS39761C-page 15
PIC18F2682/2685/4682/4685
PORTA is a bidirectional I/O port.
RA0/AN0
RA0
AN0
2
I/O
I
TTL
Analog
Digital I/O.
Analog input 0.
RA1/AN1
RA1
AN1
3
I/O
I
TTL
Analog
Digital I/O.
Analog input 1.
RA2/AN2/V
REF-
RA2
AN2
V
REF-
4
I/O
I
I
TTL
Analog
Analog
Digital I/O.
Analog input 2.
A/D reference voltage (low) input.
RA3/AN3/V
REF+
RA3
AN3
V
REF+
5
I/O
I
I
TTL
Analog
Analog
Digital I/O.
Analog input 3.
A/D reference voltage (high) input.
RA4/T0CKI
RA4
T0CKI
6
I/O
I
TTL
ST
Digital I/O.
Timer0 external clock input.
RA5/AN4/SS
/HLVDIN
RA5
AN4
SS
HLVDIN
7
I/O
I
I
I
TTL
Analog
TTL
Analog
Digital I/O.
Analog input 4.
SPI slave select input.
High/Low-Voltage Detect input.
RA6 See the OSC2/CLKO/RA6 pin.
RA7 See the OSC1/CLKI/RA7 pin.
TABLE 1-2: PIC18F2682/2685 PINOUT I/O DESCRIPTIONS (CONTINUED)
Pin Name
Pin
Number
Pin
Type
Buffer
Type
Description
PDIP,
SOIC
Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output
ST = Schmitt Trigger input with CMOS levels I = Input
O = Output P = Power