PIC18F2450_08 Datasheet, PDF (18/324 Pages) Microchip Technology – 28/40/44-Pin, High-Performance, 12 MIPS, Enhanced Flash, USB Microcontrollers with nanoWatt Technology

PIC18F2450/4450
TABLE 1-3: PIC18F4450 PINOUT I/O DESCRIPTIONS
Pin Name
Pin Number
Pin Buffer
PDIP QFN TQFP ^{Type Type}
Description
MCLR/VPP/RE3
MCLR
VPP
RE3
1 18 18
Master Clear (input) or programming voltage (input).
I
ST
Master Clear (Reset) input. This pin is an
active-low Reset to the device.
P
—
Programming voltage input.
I
ST
Digital input.
OSC1/CLKI
OSC1
CLKI
13 32 30
Oscillator crystal or external clock input.
I Analog Oscillator crystal input or external clock source input.
I Analog External clock source input. Always associated with
pin function OSC1. (See OSC2/CLKO pin.)
OSC2/CLKO/RA6
OSC2
CLKO
RA6
14 33 31
Oscillator crystal or clock output.
O—
Oscillator crystal output. Connects to crystal or
resonator in Crystal Oscillator mode.
O—
In select modes, 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.
Legend: TTL = TTL compatible input
CMOS = CMOS compatible input or output
ST = Schmitt Trigger input with CMOS levels I
= Input
O = Output
P
= Power
Note 1: These pins are No Connect unless the ICPRT Configuration bit is set. For NC/ICPORTS, the pin is No
Connect unless ICPRT is set and the DEBUG Configuration bit is cleared.
DS39760D-page 16
© 2008 Microchip Technology Inc.