PIC18LF4220-ISO 查看數據表（PDF） - Microchip Technology

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PIC18LF4220-ISO

28/40/44-Pin High-Performance, Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

Microchip Technology 

PIC18F2220/2320/4220/4320

1.0 DEVICE OVERVIEW

This document contains device specific information for

the following devices:

• PIC18F2220

• PIC18F2320

• PIC18F4220

• PIC18F4320

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 PIC18F2220/2320/4220/4320

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 PIC18F2220/2320/4220/4320

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 are

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.

• Lower Consumption in Key Modules: The power

requirements for both Timer1 and the Watchdog

Timer have been reduced by up to 80%, with typical

values of 1.8 and 2.2 µA, respectively.

1.1.2

MULTIPLE OSCILLATOR OPTIONS

AND FEATURES

All of the devices in the PIC18F2220/2320/4220/4320

family offer nine 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 a 31 kHz

INTRC clock and an 8 MHz clock with 6 program

selectable divider ratios (4 MHz to 125 kHz) for a

total of 8 clock frequencies.

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. This allows for code execu-

tion during what would otherwise be the clock start-up

interval and can even allow an application to perform

routine background activities and return to Sleep

without returning to full power operation.

1.2 Other Special Features

• Memory Endurance: The Enhanced Flash cells for

both program memory and data EEPROM are rated

to last for many thousands of erase/write cycles – up

to 100,000 for program memory and 1,000,000 for

EEPROM. Data retention without refresh is

conservatively estimated to be greater than 40 years.

• Self-programmability: These devices can write to

their own program memory spaces under internal

software control. By using a bootloader routine

located in the protected Boot Block at the top of pro-

gram memory, it becomes possible to create an

application that can update itself in the field.

• Enhanced CCP Module: In PWM mode, this

module provides 1, 2 or 4 modulated outputs for

controlling half-bridge and full-bridge drivers. Other

features include Auto-Shutdown for disabling PWM

outputs on interrupt or other select conditions and

Auto-Restart to reactivate outputs once the

condition has cleared.

• Addressable USART: This serial communication

module is capable of standard RS-232 operation

using the internal oscillator block, removing the

need for an external crystal (and its accompanying

power requirement) in applications that talk to the

outside world.

• 10-bit A/D Converter: This module incorporates

programmable acquisition time, allowing for a chan-

nel to be selected and a conversion to be initiated

without waiting for a sampling period and thus,

reduce code overhead.

• Extended Watchdog Timer (WDT): This enhanced

version incorporates a 16-bit prescaler, allowing a

time-out range from 4 ms to over 2 minutes, that is

stable across operating voltage and temperature.

 2003 Microchip Technology Inc.

DS39599C-page 7

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