PIC18F2331-I/SO【PDF 24/119 页】IC PIC MCU FLASH 4KX16 28SOIC

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PIC18F2331/2431/4331/4431

DS39616D-page 12

2010 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 Addressable USART: This serial

communication module is capable of standard

RS-232 operation and provides support for the

LIN/J2602 bus protocol. Other enhancements

include automatic baud rate detection and a 16-bit

Baud Rate Generator for improved resolution.

When the microcontroller is using the internal

oscillator block, the EUSART provides stable

operation for applications that talk to the outside

world without using an external crystal (or its

accompanying power requirement).

Extended Watchdog Timer (WDT): This

enhanced version incorporates a 16-bit prescaler,

allowing an extended time-out range that is stable

across operating voltage and temperature. See

Section 26.0 “Electrical Characteristics”

for

time-out periods.

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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