PIC18F2221T-I/SS【PDF 100/110 页】IC PIC MCU FLASH 2KX16 28SSOP

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2009 Microchip Technology Inc.

DS39689F-page 9

PIC18F2221/2321/4221/4321 FAMILY

1.0

DEVICE OVERVIEW

This document contains device specific information for

the following devices:

This family offers the advantages of all PIC18 micro-

controllers – namely, high computational performance at

an economical price – with the addition of high-

endurance, Enhanced Flash program memory. On top of

these features, the PIC18F2221/2321/4221/4321 family

introduces design enhancements that make these micro-

controllers 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 PIC18F2221/2321/4221/4321

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 27.0 “Electrical Characteristics” for

values.

1.1.2

MULTIPLE OSCILLATOR OPTIONS

AND FEATURES

All of the devices in the PIC18F2221/2321/4221/4321

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.

Two Internal Oscillator modes which provide

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.

One or both of the oscillator pins can be used for

general purpose I/O.

A Phase Lock Loop (PLL) frequency multiplier,

available to both the high-speed crystal and

internal 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 reference

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.

PIC18F2221

PIC18LF2221

PIC18F2321

PIC18LF2321

PIC18F4221

PIC18LF4221

PIC18F4321

PIC18LF4321

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