PIC18FXX8 Datasheet, PDF (12/402 Pages) Microchip Technology – 28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module

PIC18FXX8
TABLE 1-2: PIC18FXX8 PINOUT I/O DESCRIPTIONS
Pin Name
Pin Number
PIC18F248/258 PIC18F448/458
SPDIP, SOIC PDIP TQFP PLCC
Pin
Type
Buffer
Type
Description
MCLR/VPP
MCLR
VPP
NC
OSC1/CLKI
OSC1
CLKI
OSC2/CLKO/RA6
OSC2
CLKO
1
1
18
2
—
— 12, 13, 1, 17,
33, 34 28, 40
9
13
30
14
10
14
31
15
RA6
Legend:
TTL = TTL compatible input
ST = Schmitt Trigger input with CMOS levels
I = Input
P = Power
Master Clear (input) or
programming voltage (output).
I
ST
Master Clear (Reset) input.
This pin is an active low Reset
to the device.
P
—
Programming voltage input.
—
— These pins should be left
unconnected.
Oscillator crystal or external clock
input.
I CMOS/ST Oscillator crystal input or
external clock source input. ST
buffer when configured in RC
mode; otherwise, CMOS.
I CMOS
External clock source input.
Always associated with pin
function OSC1 (see OSC1/
CLKI, OSC2/CLKO pins).
Oscillator crystal or clock output.
O
—
Oscillator crystal output.
Connects to crystal or
resonator in Crystal Oscillator
mode.
O
—
In RC mode, OSC2 pin outputs
CLKO, which has 1/4 the
frequency of OSC1 and
denotes the instruction cycle
rate.
I/O TTL
General purpose I/O pin.
CMOS = CMOS compatible input or output
Analog = Analog input
O
= Output
OD = Open-Drain (no P diode to VDD)
DS41159D-page 10
 2004 Microchip Technology Inc.