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Sheet目录3832

147页 148页 149页 150页 [151页]

2008 Microchip Technology Inc.

DS39631E-page 7

PIC18F2420/2520/4420/4520

1.0

DEVICE OVERVIEW

This document contains device-specific information for

the following devices:

This family offers the advantages of all PIC18

microcontrollers – namely, high computational perfor-

mance at an economical price – with the addition of

high-endurance, Enhanced Flash program memory.

On top of these features, the PIC18F2420/2520/4420/

4520 family introduces design enhancements that

make these microcontrollers a logical choice for many

high-performance, power sensitive applications.

1.1

New Core Features

1.1.1

nanoWatt TECHNOLOGY

All of the devices in the PIC18F2420/2520/4420/4520

family incorporate a range of features that can signifi-

cantly reduce power consumption during operation.

Key items include:

Alternate Run Modes: By clocking the controller

from the Timer1 source or the internal oscillator

block, power consumption during code execution

can be reduced by as much as 90%.

Multiple Idle Modes: The controller can also run

with its CPU core disabled but the peripherals still

active. In these states, power consumption can be

reduced even further, to as little as 4% of normal

operation requirements.

On-the-Fly Mode Switching: The power-

managed modes are invoked by user code during

operation, allowing the user to incorporate

power-saving ideas into their application’s

software design.

Low Consumption in Key Modules: The

power requirements for both Timer1 and the

Watchdog Timer are minimized. See

Section 26.0 “Electrical Characteristics”

for values.

1.1.2

MULTIPLE OSCILLATOR OPTIONS

AND FEATURES

All of the devices in the PIC18F2420/2520/4420/4520

family offer ten different oscillator options, allowing

users a wide range of choices in developing application

hardware. These include:

Four Crystal modes, using crystals or ceramic

resonators

Two External Clock modes, offering the option of

using two pins (oscillator input and a divide-by-4

clock output) or one pin (oscillator input, with the

second pin reassigned as general I/O)

Two External RC Oscillator modes with the same

pin options as the External Clock modes

An internal oscillator block which provides an

8 MHz clock and an INTRC source

(approximately 31 kHz), as well as a range of

6 user-selectable clock frequencies, between

125 kHz to 4 MHz, for a total of 8 clock

frequencies. This option frees the two oscillator

pins for use as additional general purpose I/O.

A Phase Lock Loop (PLL) frequency multiplier,

available to both the High-Speed Crystal and Inter-

nal Oscillator modes, which allows clock speeds of

up to 40 MHz. Used with the internal oscillator, the

PLL gives users a complete selection of clock

speeds, from 31 kHz to 32 MHz – all without using

an external crystal or clock circuit.

Besides its availability as a clock source, the internal

oscillator block provides a stable reference source that

gives the family additional features for robust

operation:

Fail-Safe Clock Monitor: This option constantly

monitors the main clock source against a refer-

ence signal provided by the internal oscillator. If a

clock failure occurs, the controller is switched to

the internal oscillator block, allowing for continued

low-speed operation or a safe application

shutdown.

Two-Speed Start-up: This option allows the

internal oscillator to serve as the clock source

from Power-on Reset, or wake-up from Sleep

mode, until the primary clock source is available.

PIC18F2420

PIC18LF2420

PIC18F2520

PIC18LF2520

PIC18F4420

PIC18LF4420

PIC18F4520

PIC18LF4520

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