PIC18CXX2_13 Datasheet, PDF (13/304 Pages) Microchip Technology – High Performance Microcontrollers with 10-bit A/D

PIC18CXX2
TABLE 1-3: PIC18C4X2 PINOUT I/O DESCRIPTIONS
Pin Name
Pin Number
Pin Buffer
DIP PLCC TQFP ^{Type Type}
Description
MCLR/VPP
MCLR
VPP
1
2
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.
NC
—
—
— These pins should be left unconnected.
OSC1/CLKI
OSC1
CLKI
13 14 30
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 14 15 31
Oscillator crystal output.
OSC2
O
—
Oscillator crystal output. Connects to crystal
or resonator in Crystal Oscillator mode.
CLKO
O
—
In RC mode, OSC2 pin outputs CLKOUT, which has
1/4 the frequency of OSC1 and denotes the instruction
cycle rate.
RA6
I/O TTL
General Purpose I/O pin.
PORTA is a bi-directional I/O port.
RA0/AN0
RA0
AN0
2
3
19
I/O TTL
Digital I/O.
I Analog Analog input 0.
RA1/AN1
RA1
AN1
3
4
20
I/O TTL
Digital I/O.
I Analog Analog input 1.
RA2/AN2/VREF-
RA2
AN2
VREF-
4
5
21
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
6
22
I/O TTL
Digital I/O.
I Analog Analog input 3.
I Analog A/D Reference Voltage (High) input.
RA4/T0CKI
RA4
T0CKI
6
7
23
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
8
24
I/O TTL
Digital I/O.
I Analog Analog input 4.
I
ST
SPI Slave Select input.
I Analog 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
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DS39026D-page 13