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PIC18F2450/4450

2008 Microchip Technology Inc.

DS39760D-page 7

1.0

DEVICE OVERVIEW

This document contains device-specific information for

the following devices:

This family of devices offers the advantages of all

PIC18 microcontrollers – namely, high computational

performance at an economical price – with the addi-

tion of high-endurance, Enhanced Flash program

memory.

addition

these

features,

the

PIC18F2450/4450 family introduces design enhance-

ments 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 PIC18F2450/4450 family

incorporate a range of features that can significantly

reduce power consumption during operation. Key

items include:

Alternate Run Modes: By clocking the controller

from the Timer1 source or the internal RC

oscillator, 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 21.0 “Electrical Characteristics” for

values.

1.1.2

UNIVERSAL SERIAL BUS (USB)

Devices in the PIC18F2450/4450 family incorporate a

fully featured Universal Serial Bus communications

module that is compliant with the USB Specification

Revision 2.0. The module supports both low-speed and

full-speed communication for all supported data

transfer types. It also incorporates its own on-chip

transceiver and 3.3V regulator and supports the use of

external transceivers and voltage regulators.

1.1.3

MULTIPLE OSCILLATOR OPTIONS

AND FEATURES

All of the devices in the PIC18F2450/4450 family offer

twelve different oscillator options, allowing users a wide

range of choices in developing application hardware.

These include:

Four Crystal modes using crystals or ceramic

resonators.

Four 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).

An INTRC source (approximately 31 kHz, stable

over temperature and VDD). This option frees an

oscillator pin for use as an additional general

purpose I/O.

A Phase Lock Loop (PLL) frequency multiplier,

available to both the High-Speed Crystal and

External Oscillator modes, which allows a wide

range of clock speeds from 4 MHz to 48 MHz.

Asynchronous dual clock operation, allowing the

USB module to run from a high-frequency

oscillator while the rest of the microcontroller is

clocked from an internal low-power oscillator.

The internal oscillator 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

reference signal provided by the internal

oscillator. If a clock failure occurs, the controller is

switched to the internal oscillator, 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.

PIC18F2450

PIC18F4450

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