PIC18LF252-ISP Datasheet, PDF (15/332 Pages) Microchip Technology – High-Performance, Enhanced Flash Microcontrollers with 10-Bit A/D

PIC18FXX2
TABLE 1-3: PIC18F4X2 PINOUT I/O DESCRIPTIONS
Pin Name
Pin Number
Pin Buffer
DIP PLCC TQFP ^{Type Type}
Description
MCLR/VPP
MCLR
VPP
NC
OSC1/CLKI
OSC1
CLKI
1
2 18
I
ST
I
ST
—
—
—
13 14 30
I
ST
I CMOS
OSC2/CLKO/RA6 14 15 31
OSC2
O
—
CLKO
O
—
RA6
I/O TTL
RA0/AN0
RA0
AN0
2
3 19
I/O TTL
I Analog
RA1/AN1
RA1
AN1
3
4 20
I/O TTL
I Analog
RA2/AN2/VREF-
RA2
AN2
VREF-
4
5 21
I/O TTL
I Analog
I Analog
RA3/AN3/VREF+
RA3
AN3
VREF+
5
6 22
I/O TTL
I Analog
I Analog
RA4/T0CKI
RA4
T0CKI
6
7 23
I/O ST/OD
I
ST
RA5/AN4/SS/LVDIN 7
RA5
AN4
SS
LVDIN
8 24
I/O TTL
I Analog
I
ST
I Analog
RA6
Legend: TTL = TTL compatible input
ST = Schmitt Trigger input with CMOS levels
O = Output
OD = Open Drain (no P diode to VDD)
Master Clear (input) or high voltage ICSP
programming enable pin.
Master Clear (Reset) input. This pin is an active
low RESET to the device.
High voltage ICSP programming enable pin.
These pins should be left unconnected.
Oscillator crystal or external clock input.
Oscillator crystal input or external clock source
input. ST buffer when configured in RC mode,
CMOS otherwise.
External clock source input. Always associated
with pin function OSC1. (See related OSC1/CLKI,
OSC2/CLKO pins.)
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.
General Purpose I/O pin.
PORTA is a bi-directional I/O port.
Digital I/O.
Analog input 0.
Digital I/O.
Analog input 1.
Digital I/O.
Analog input 2.
A/D Reference Voltage (Low) input.
Digital I/O.
Analog input 3.
A/D Reference Voltage (High) input.
Digital I/O. Open drain when configured as output.
Timer0 external clock input.
Digital I/O.
Analog input 4.
SPI Slave Select input.
Low Voltage Detect Input.
(See the OSC2/CLKO/RA6 pin.)
CMOS = CMOS compatible input or output
I = Input
P = Power
© 2006 Microchip Technology Inc.
DS39564C-page 13