Datasheet

© 2007 Microchip Technology Inc. DS39629C-page 13
PIC18F6390/6490/8390/8490
PORTA is a bidirectional I/O port.
RA0/AN0
RA0
AN0
24
I/O
I
TTL
Analog
Digital I/O.
Analog input 0.
RA1/AN1
RA1
AN1
23
I/O
I
TTL
Analog
Digital I/O.
Analog input 1.
RA2/AN2/V
REF-/SEG16
RA2
AN2
V
REF-
SEG16
22
I/O
I
I
O
TTL
Analog
Analog
Analog
Digital I/O.
Analog input 2.
A/D reference voltage (Low) input.
SEG16 output for LCD.
RA3/AN3/V
REF+/SEG17
RA3
AN3
V
REF+
SEG17
21
I/O
I
I
O
TTL
Analog
Analog
Analog
Digital I/O.
Analog input 3.
A/D reference voltage (High) input.
SEG17 output for LCD.
RA4/T0CKI/SEG14
RA4
T0CKI
SEG14
28
I/O
I
O
ST/OD
ST
Analog
Digital I/O. Open-drain when configured as output.
Timer0 external clock input.
SEG14 output for LCD.
RA5/AN4/HLVDIN/SEG15
RA5
AN4
HLVDIN
SEG15
27
I/O
I
I
O
TTL
Analog
Analog
Analog
Digital I/O.
Analog input 4.
Low-Voltage Detect input.
SEG15 output for LCD.
RA6 See the OSC2/CLKO/RA6 pin.
RA7 See the OSC1/CLKI/RA7 pin.
TABLE 1-2: PIC18F6X90 PINOUT I/O DESCRIPTIONS (CONTINUED)
Pin Name
Pin Number
Pin
Type
Buffer
Type
Description
TQFP
Legend: TTL = TTL compatible input CMOS = CMOS compatible input or output
ST = Schmitt Trigger input with CMOS levels Analog = Analog input
I = Input O = Output
P = Power OD = Open-Drain (no P diode to V
DD)
Note 1: Default assignment for CCP2 when Configuration bit, CCP2MX, is set.
2: Alternate assignment for CCP2 when Configuration bit, CCP2MX, is cleared.