
PIC18F66K80 FAMILY
DS39977F-page 18
2010-2012 Microchip Technology Inc.
TABLE 1-4:
PIC18F2XK80 I/O DESCRIPTIONS
Pin Name
Pin Number
Pin
Type
Buffer
Type
Description
QFN
SSOP/
SPDIP
/SOIC
MCLR/RE3
26
1
MCLR
I
ST
Master Clear (input) or programming voltage (input). This
pin is an active-low Reset to the device.
RE3
I
ST
General purpose, input only pin.
OSC1/CLKIN/RA7
6
9
OSC1
I
ST
Oscillator crystal input.
CLKIN
I
CMOS External clock source input. Always associated with pin
function, OSC1. (See related OSC1/CLKI, OSC2/CLKO
pins.)
RA7
I/O
ST/
CMOS
General purpose I/O pin.
OSC2/CLKOUT/RA6
7
10
OSC2
O
—
Oscillator crystal output.
Connects to crystal or resonator in Crystal Oscillator mode.
CLKOUT
O
—
In certain oscillator modes, OSC2 pin outputs CLKO, which
has 1/4 the frequency of OSC1 and denotes the instruction
cycle rate.
RA6
I/O
ST/
CMOS
General purpose I/O pin.
Legend:
CMOS = CMOS compatible input or output
I2C
= I2C/SMBus input buffer
ST
= Schmitt Trigger input with CMOS levels
Analog = Analog input
I
= Input
O
= Output
P= Power