设计了一个基于现场可编程门阵列（FPGA）和AT89S51单片机相结合的低频数字相位测量仪,The paper has designed a low frequency digital phase measuring instrument based on the system which communicates FPGA and the microcontroller (AT89S51).

基于89C51单片机技术，介绍了一种数字式频率计数器，该频率计具有操作简单方便、响应速度快、体积小等一系列优点。可以及时准确地测量低频信号的频率。-Based on the 89C51 single-chip technology, introduces a digital frequency counter, the frequency meter is simple convenient, fast response, a series of advantages of small size

计数器基于凌阳SPCE061A微处理器设计,对高频信号采用测频法,提高精度,对低频信号采用测周法,可最大限度减小误差。能够接收函数信号发生器产生的信号,实现周期测量和时间间隔测量。可记忆10个测量的历史数据,实现语音报数功能且能够显示温度等多种功能。本系统经实验调试,较好地实现了预定的功能,由于采用了凌阳单片机控制,系统可靠性和性价比较高。- The designed counter adopts Sunplus SPCE061A MCU,uses frequency measurement f