PIC18F2331 Datasheet, PDF (17/396 Pages) Microchip Technology – 28/40/44-Pin Enhanced Flash Microcontrollers with nanoWatt Technology, High Performance PWM and A/D

PIC18F2331/2431/4331/4431
TABLE 1-3: PIC18F4331/4431 PINOUT I/O DESCRIPTIONS
Pin Name
Pin Number
Pin Buffer
DIP TQFP QFN ^{Type Type}
Description
MCLR/VPP/RE3
MCLR
VPP
RE3
OSC1/CLKI/RA7
OSC1
CLKI
RA7
OSC2/CLKO/RA6
OSC2
CLKO
RA6
RA0/AN0
RA0
AN0
1 18 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.
I
ST
Digital input. Available only when MCLR is disabled.
13 30 32
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.
14 31 33
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.
2 19 19
I/O TTL Digital I/O.
I Analog Analog input 0.
RA1/AN1
RA1
AN1
3 20 20
I/O TTL Digital I/O.
I Analog Analog input 1.
RA2/AN2/VREF-/CAP1/ 4
INDX
RA2
AN2
VREF-
CAP1
INDX
21 21
I/O TTL
I Analog
I Analog
I ST
I ST
Digital I/O.
Analog input 2.
A/D Reference Voltage (Low) input.
Input capture pin 1.
Quadrature Encoder Interface index input pin.
RA3/AN3/VREF+/
CAP2/QEA
RA3
AN3
VREF+
CAP2
QEA
5 22 22
I/O TTL
I Analog
I Analog
I ST
I ST
Digital I/O.
Analog input 3.
A/D Reference Voltage (High) input.
Input capture pin 2.
Quadrature Encoder Interface channel A input pin.
RA4/AN4/CAP3/QEB 6
RA4
AN4
CAP3
QEB
23 23
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.
RA5/AN5/LVDIN
RA5
AN5
LVDIN
7 24 24
I/O TTL
I Analog
I Analog
Legend: TTL
ST
O
OD
= TTL compatible input
= Schmitt Trigger input with CMOS levels
= Output
= Open-Drain (no diode to VDD)
Digital I/O.
Analog input 5.
Low-voltage Detect input.
CMOS = CMOS compatible input or output
I
= Input
P
= Power
 2003 Microchip Technology Inc.
Preliminary
DS39616B-page 15