PIC18F2331_07 Datasheet, PDF (16/400 Pages) Microchip Technology – 28/40/44-Pin Enhanced Flash Microcontrollers with nanoWatt Technology, High Performance PWM and A/D

PIC18F2331/2431/4331/4431
TABLE 1-2: PIC18F2331/2431 PINOUT I/O DESCRIPTIONS
Pin Name
Pin Number
Pin Buffer
SPDIP,
SOIC
QFN ^Type
Type
Description
MCLR/VPP/RE3
MCLR
VPP
RE3
1 26
Master Clear (input) or programming voltage (input).
I
ST
Master Clear (Reset) input. This pin is an active-low
Reset to the device.
P
High-voltage ICSP™ programming enable pin.
I
ST
Digital input. Available only when MCLR is disabled.
OSC1/CLKI/RA7
OSC1
CLKI
RA7
9
6
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/CLKI, OSC2/CLKO
pins.)
I/O TTL General purpose I/O pin.
OSC2/CLKO/RA6
OSC2
CLKO
RA6
10 7
Oscillator crystal or clock output.
O—
Oscillator crystal output. Connects to crystal or
resonator in Crystal Oscillator mode.
O—
In RC mode, OSC2 pin outputs CLKO, which has 1/4
the frequency of OSC1 and denotes the instruction
cycle rate.
I/O TTL General purpose I/O pin.
PORTA is a bidirectional I/O port.
RA0/AN0
RA0
AN0
2 27
I/O TTL Digital I/O.
I Analog Analog input 0.
RA1/AN1
RA1
AN1
3 28
I/O TTL Digital I/O.
I Analog Analog input 1.
RA2/AN2/VREF-/CAP1/INDX 4
RA2
AN2
VREF-
CAP1
INDX
1
I/O TTL Digital I/O.
I Analog Analog input 2.
I Analog A/D reference voltage (low) input.
I
ST
Input capture pin 1.
I
ST
Quadrature Encoder Interface index input pin.
RA3/AN3/VREF+/CAP2/QEA 5
RA3
AN3
VREF+
CAP2
QEA
2
I/O TTL Digital I/O.
I Analog Analog input 3.
I Analog A/D reference voltage (high) input.
I
ST
Input capture pin 2.
I
ST
Quadrature Encoder Interface channel A input pin.
RA4/AN4/CAP3/QEB
RA4
AN4
CAP3
QEB
6
3
I/O TTL Digital I/O.
I Analog Analog input 4.
I
ST
Input capture pin 3.
I
ST
Quadrature Encoder Interface channel B input pin.
Legend:
TTL = TTL compatible input
ST = Schmitt Trigger input with CMOS levels
O = Output
OD = Open-Drain (no diode to VDD)
CMOS = CMOS compatible input or output
I
= Input
P
= Power
DS39616C-page 14
Preliminary
© 2007 Microchip Technology Inc.