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PIC18F4220 Datasheet(PDF) 9 Page - Microchip Technology |
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PIC18F4220 Datasheet(HTML) 9 Page - Microchip Technology |
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9 / 388 page  2003 Microchip Technology Inc. DS39599C-page 7 PIC18F2220/2320/4220/4320 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 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. • PIC18F2220 • PIC18F4220 • PIC18F2320 • PIC18F4320 |
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