PIC18LF4331 datasheet(19/392 Pages) MICROCHIP

19 / 392 page

 2010 Microchip Technology Inc.

DS39616D-page 19

PIC18F2331/2431/4331/4431

TABLE 1-3:

PIC18F4331/4431 PINOUT I/O DESCRIPTIONS

Pin Name

Pin Number

Type

Buffer

Type

Description

PDIP TQFP QFN

MCLR/VPP/RE3

MCLR

VPP

RE3

118

Master Clear (input) or programming voltage (input).

Master Clear (Reset) input. This pin is an active-low

Reset to the device.

Programming voltage input.

Digital input. Available only when MCLR is disabled.

OSC1/CLKI/RA7

OSC1

CLKI

RA7

I/O

CMOS

TTL

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.)

General purpose I/O pin.

OSC2/CLKO/RA6

OSC2

CLKO

RA6

I/O

—

TTL

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.

Legend:

TTL = TTL compatible input

CMOS = CMOS compatible input or output

ST = Schmitt Trigger input with CMOS levels

= Input

= Output

= Power

Note 1:

RC3 is the alternate pin for T0CKI/T5CKI; RC4 is the alternate pin for SDI/SDA; RC5 is the alternate pin

for SCK/SCL; RC7 is the alternate pin for SDO.

RD4 is the alternate pin for FLTA.

RD5 is the alternate pin for PWM4.

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