
2002 Microchip Technology Inc.
Preliminary
DS30485A-page 15
PIC18FXX39
PORTB is a bi-directional I/O port. PORTB can be
software programmed for internal weak pull-ups on all
inputs.
RB0/INT0
RB0
INT0
33
9
8
I/O
I
TTL
ST
Digital I/O.
External interrupt 0.
RB1/INT1
RB1
INT1
34
10
9
I/O
I
TTL
ST
Digital I/O.
External interrupt 1.
RB2/INT2
RB2
INT2
35
11
10
I/O
I
TTL
ST
Digital I/O.
External interrupt 2.
RB3
36
12
11
I/O
TTL
Digital I/O.
RB4
37
14
I/O
TTL
Digital I/O. Interrupt-on-change pin.
RB5/PGM
RB5
PGM
38
15
I/O
TTL
ST
Digital I/O. Interrupt-on-change pin.
Low Voltage ICSP programming enable pin.
RB6/PGC
RB6
PGC
39
16
I/O
TTL
ST
Digital I/O. Interrupt-on-change pin.
In-Circuit Debugger and ICSP programming
clock pin.
RB7/PGD
RB7
PGD
40
17
I/O
TTL
ST
Digital I/O. Interrupt-on-change pin.
In-Circuit Debugger and ICSP programming
data pin.
TABLE 1-3:
PIC18F4X39 PINOUT I/O DESCRIPTIONS (CONTINUED)
Pin Name
Pin Number
Pin
Type
Buffer
Type
Description
DIP
QFN TQFP
Legend: TTL = TTL compatible input
CMOS = CMOS compatible input or output
ST = Schmitt Trigger input with CMOS levels
I
= Input
O= Output
P
= Power
OD = Open Drain (no P diode to VDD)