PIC18F258 datasheet(12/384 Pages) MICROCHIP

Part #	PIC18F258

Description	High Performance, 28/40-Pin Enhanced FLASH Microcontrollers with CAN

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Manufacturer	MICROCHIP [Microchip Technology]

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PIC18FXX8

DS41159B-page 10

Preliminary

 2002 Microchip Technology Inc.

TABLE 1-2:

PIC18FXX8 PINOUT I/O DESCRIPTIONS

Pin Name

Pin Number

Type

Buffer

Type

Description

PIC18F248/258

PIC18F448/458

SPDIP, SOIC

PDIP

TQFP

PLCC

MCLR/VPP

MCLR

VPP

11

18

2

I

P

ST

—

Master Clear (input) or

programming voltage (output).

Master Clear (Reset) input.

This pin is an active low

RESET to the device.

Programming voltage input.

NC

——

12, 13,

33, 34

1, 17,

28, 40

——

These pins should be left

unconnected.

OSC1/CLKI

OSC1

CLKI

9

133014

I

CMOS/ST

CMOS

Oscillator crystal or external clock

input.

Oscillator crystal input or

external clock source input. ST

buffer when configured in RC

mode. Otherwise CMOS.

External clock source input.

Always associated with pin

function OSC1 (see OSC1/

CLKI, OSC2/CLKO pins).

OSC2/CLKO/RA6

OSC2

CLKO

RA6

10

14

31

15

O

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

Analog = Analog input

I

=

Input

O

= Output

P

=

Power

OD

= Open Drain (no P diode to VDD)

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