基于串口的基线PIC单片机内部振荡器的重新校准  

Recalibration of baseline PIC microcontroller internal oscillator based on serial communication

作　　者：刘宝成[1] 韩伟[1] 

机构地区：[1]内蒙古民族大学物理与电子信息学院,内蒙古通辽028043

出　　处：《微型机与应用》2014年第19期30-33,共4页Microcomputer & Its Applications

基　　金：内蒙古自然科学基金(2013MS0922)

摘　　要：基线PIC单片机多数都有内部振荡器。对于时间敏感型应用,如果丢失内部振荡器校准值,就必须对振荡器进行重新校准。本文以PIC10F202为例,研究了一种基于异步串行通信原理,利用接收端的时钟信号,对基线PIC单片机的内部振荡器进行重新校准的方法。该方法简单实用,不用设计复杂的外部电路,也不需要使用信号源、示波器或频率计。实际测试表明,校准精度满足出厂参数要求。此外,该方法还可在单片机的允许振荡频率范围内将振荡器频率标定为某一特定频率值。Most of the baseline PIC microcontrollers have an internal oscillator. For time sensitive applications, the oscillator should be recalibrated if the internal oscillator calibration value is lost. In this paper, with the PIC10F202 as an example, a serial communication based recalibration method is studied, which uses receiving end clock signal to recalibrate the baseline PIC microcontroller internal oscillator. The method is very simple and practical because it does not have to design the complex external circuit, or use the signal source, oscilloscope or frequency meter. The practical test shows that the calibration accuracy meets demand of factory parameters. In addition, the method can also be used to calibrate the microcontroller oscillator frequency to a certain value within its acceptable range.

关 键 词：基线PIC单片机 内部振荡器 重新校准 

分 类 号：TP368[自动化与计算机技术—计算机系统结构]