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 2010 Microchip Technology Inc.DS39576C-page 1

PIC18FXX2/XX8

1.0DEVICE OVERVIEW

This document includes the programming specifica-

tions for the following devices:

• PIC18F242

• PIC18F248

• PIC18F252

• PIC18F258

• PIC18F442

• PIC18F448

• PIC18F452

• PIC18F458

2.0PROGRAMMING OVERVIEW

OF THE PIC18FXX2/XX8

The PIC18FXX2/XX8 can be programmed using the

high voltage In-Circuit Serial ProgrammingTM(ICSPTM)

method, or the low voltage ICSP method. Both of these

can be done with the device in the users’ system. The

low voltage ICSP method is slightly different than the

high voltage method, and these differences are noted

where applicable. This programming specification

applies to PIC18FXX2/XX8 devices in all package

types.

2.1Hardware Requirements

In high voltage ICSP mode, the PIC18FXX2/XX8

requires two programmable power supplies: one for

VDDand one for MCLR/VPP. Both supplies should have

a minimum resolution of 0.25V. Refer to Section 6.0 for

additional hardware parameters.

2.1.1LOW VOLTAGE ICSP

PROGRAMMING

In low voltage ICSP mode, the PIC18FXX2/XX8 can be

programmed using a VDDsource in the operating

range. This only means that MCLR/VPP does not have

to be brought to a different voltage, but can instead be

left at the normal operating voltage. Refer to

Section 6.0 for additional hardware parameters.

2.2Pin Diagrams

The pin diagrams for the PIC18FXX2/XX8 family are

shown in Figure 2-1. The pin descriptions of these dia-

grams do not represent the complete functionality of

the device types. Users should refer to the appropriate

device data sheet for complete pin descriptions.

TABLE 2-1:PIN DESCRIPTIONS (DURING PROGRAMMING): PIC18FXX2/XX8

Pin Name

During Programming

Pin NamePin TypePin Description

MCLR/VPP VPP PProgramming Enable

VDD DDVPPower Supply

Vss VSS P Ground

RB5PGMILow Voltage ICSP™ Input when LVP

Configuration bit equals ‘1’(1)

RB6SCLKISerial Clock

RB7SDATAI/OSerial Data

Legend:I = Input, O = Output, P = Power

Note 1:See Section 5.3for more detail.

Flash Microcontroller Programming Specification

Produktspecifikationer