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PIC18F4431 Datasheet(PDF) 10 Page - Microchip Technology |
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PIC18F4431 Datasheet(HTML) 10 Page - Microchip Technology |
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10 / 396 page  PIC18F2331/2431/4331/4431 DS39616B-page 8 Preliminary 2003 Microchip Technology Inc. 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 100 years. • Self-programmability: These devices can write to their own program memory spaces under inter- nal software control. By using a bootloader routine located in the protected Boot Block at the top of program memory, it becomes possible to create an application that can update itself in the field. • Power Control PWM 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 on fault detection and Auto-Restart to reactivate outputs once the condition has cleared. • Enhanced 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 accompany- ing power requirement) in applications that talk to the outside world. This module also includes auto- baud detect and LIN capability. • High-speed 10-bit A/D Converter: This module incorporates Programmable Acquisition Time, allowing for a channel to be selected and a conversion to be initiated without waiting for a sampling period and thus, reducing code overhead. • Motion Feedback Module (MFM): This module features a Quadrature Encoder Interface (QEI) and an Input Capture (IC) module. The QEI accepts two phase inputs (QEA, QEB) and one index input (INDX) from an incremental encoder. The QEI supports high and low precision position tracking, direction status and change of direction interrupt, and velocity measurement. The input capture features 3 channels of independent input capture with Timer5 as the time base, a special event trigger to other modules, and an adjustable noise filter on each IC input. • 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. |
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