PIC18CXX2_13 Datasheet, PDF (10/304 Pages) Microchip Technology – High Performance Microcontrollers with 10-bit A/D

PIC18CXX2
TABLE 1-2: PIC18C2X2 PINOUT I/O DESCRIPTIONS
Pin Name
Pin Number _{Pin Buffer}
DIP SOIC ^{Type Type}
Description
MCLR/VPP
MCLR
VPP
1
1
I
P
Master clear (input) or programming voltage (input).
ST
Master Clear (Reset) input. This pin is an active low
RESET to the device.
Programming voltage input.
NC
— ——
— These pins should be left unconnected.
OSC1/CLKI
OSC1
CLKI
9
9
Oscillator crystal or external clock input.
I
ST
Oscillator crystal input or external clock source input.
ST buffer when configured in RC mode. CMOS otherwise.
I CMOS
External clock source input. Always associated with
pin function OSC1. (See related OSC1/CLKIN,
OSC2/CLKOUT pins.)
OSC2/CLKO/RA6
OSC2
CLKO
RA6
10 10
O
O
I/O
Oscillator crystal or clock output.
—
Oscillator crystal output. Connects to crystal or
resonator in Crystal Oscillator mode.
—
In RC mode, OSC2 pin outputs CLKOUT which has 1/4
the frequency of OSC1, and denotes the instruction
cycle rate.
TTL
General Purpose I/O pin.
PORTA is a bi-directional I/O port.
RA0/AN0
RA0
AN0
2
2
I/O TTL
Digital I/O.
I Analog
Analog input 0.
RA1/AN1
RA1
AN1
3
3
I/O TTL
Digital I/O.
I Analog
Analog input 1.
RA2/AN2/VREF-
RA2
AN2
VREF-
4
4
I/O TTL
Digital I/O.
I Analog
Analog input 2.
I Analog
A/D Reference Voltage (Low) input.
RA3/AN3/VREF+
RA3
AN3
VREF+
5
5
I/O TTL
Digital I/O.
I Analog
Analog input 3.
I Analog
A/D Reference Voltage (High) input.
RA4/T0CKI
RA4
T0CKI
6
6
I/O ST/OD
Digital I/O. Open drain when configured as output.
I
ST
Timer0 external clock input.
RA5/AN4/SS/LVDIN 7
RA5
AN4
SS
LVDIN
7
I/O TTL
I Analog
I
ST
I Analog
Digital I/O.
Analog input 4.
SPI Slave Select input.
Low Voltage Detect Input.
RA6
See the OSC2/CLKO/RA6 pin.
Legend:
TTL = TTL compatible input
ST = Schmitt Trigger input with CMOS levels
O = Output
OD = Open Drain (no P diode to VDD)
CMOS = CMOS compatible input or output
I = Input
P = Power
DS39026D-page 10
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