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介绍了采用MCS-51单片机内部高精度频率源与定时/计数器对信号频率(或周期)进行精确测量的技术方法;分析了对被测信号是选择测频法测量还是选择测周法测量以减少测量误差的理论依据:给出了测频法和测周法的控制程序。
This paper introduces the technical method of accurately measuring the signal frequency (or period) by using the internal high precision frequency source and timer / counter in the MCS-51 singlechip. It analyzes whether to select the frequency measurement method or the measurement method to reduce the measured signal Measurement error of the theoretical basis: given the frequency measurement method and measurement week control procedures.