在对三种测频方法进行分析的基础上，介绍了基于EDA技术的等精度测频原理。给出采用AT89C51实现控制并通过FPGA来设计多功能等精度数字频率计的具体方法。该频率计可以兼顾频率计对速度、资源和测频精度等各方面的优化需求。-Frequency of three methods of analysis based on EDA technology based on the principle of frequency measurement accuracy, etc.. AT89C51 give

AT89c51 1602 可以分频的频率计，最大可以测量98MHZ,程序部分设计得精良！-AT89 c 511602 the frequency that can divide repeatedly account, biggest can measure a 98 Mhz, the procedure part designs excellent!