PIC18F2480/2580/4480/4580
TABLE 1-3:
Pin Name
PIC18F4480/4580 PINOUT I/O DESCRIPTIONS
Pin Number
Pin Buffer
Type Type
Description
PDIP QFN TQFP
MCLR/VPP/RE3
MCLR
1
18
18
Master Clear (input) or programming voltage (input).
Master Clear (Reset) input. This pin is an
active-low Reset to the device.
Programming voltage input.
I
ST
VPP
RE3
P
I
ST
ST
Digital input.
OSC1/CLKI/RA7
OSC1
13
32
30
Oscillator crystal or external clock input.
Oscillator crystal input or external clock source input.
ST buffer when configured in RC mode;
CMOS otherwise.
I
I
CLKI
CMOS
TTL
External clock source input. Always associated with
pin function OSC1. (See related OSC1/CLKI,
OSC2/CLKO pins.)
RA7
I/O
General purpose I/O pin.
OSC2/CLKO/RA6
OSC2
14
33
31
Oscillator crystal or clock output.
Oscillator crystal output. Connects to crystal or
resonator in Crystal Oscillator mode.
In RC mode, OSC2 pin outputs CLKO which has 1/4
the frequency of OSC1 and denotes the instruction
cycle rate.
O
O
—
—
CLKO
RA6
I/O
TTL
General purpose I/O pin.
Legend: TTL = TTL compatible input
ST = Schmitt Trigger input with CMOS levels
= Output
I2C = I2C™/SMBus input buffer
CMOS = CMOS compatible input or output
I
= Input
O
P
= Power
DS39637D-page 18
© 2009 Microchip Technology Inc.
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