MC9S12DG128单片机在频率测量系统中的应用  

Application of MC9S12DG128 Microcontroller to Frequency Measuring System

作　　者：杜慧勇[1] 谢春华[1] 王站成[1] 

机构地区：[1]河南科技大学车辆与动力工程学院,河南洛阳471003

出　　处：《河南科技大学学报（自然科学版）》2009年第3期40-42,共3页Journal of Henan University of Science And Technology:Natural Science

基　　金：河南省教育厅自然科学基础研究基金项目(2006470001)

摘　　要：分析了几种常用频率测量方法(测频法、测周法和多周期同步法)的测量原理和测量误差,对其优缺点进行了比较,提出了一种实用的测频+测周求平均的方法,并分析了该方法在MC9S12DG128单片机频率测量系统中测量转换的临界点和相对误差,给出了具体的测量方法和实现流程,并利用MC9S12DG128单片机运算速度快,机器周期小等优点,从而实现了该系统的测量精度高、自适应性强、测量量程宽、电路结构简单的特点。The measuring principles and measuring error of three frequency measuring methods (frequency measuring method,period measuring method,and multi-period synchronize method) were analyzed in this paper.An integration method of frequency and period was presented,the switch point of measuring method and relative error of this frequency measuring system were analyzed.This method makes use of the high calculation speed of MC9S12DG128 microcontroller to realize high measuring precision, strong adapting ability,wide measuring range,and simple circuit.

关 键 词：单片机 频率 测量 

分 类 号：TP271.81[自动化与计算机技术—检测技术与自动化装置]