"基于AT89C51单片机的精度频率测量仪设计与优化研究"

摘要 本文介绍了一种使用51单片机完成的高精度频率测量仪的设计。频率测量是电子学中最基本的测量之一，频率计由信号输入和放大电路、单片机模块、分频模块及显示电路模块组成。本设计采用AT89C51单片机作为控制核心，完成待测信号的计数、译码、显示以及对分频比的控制。利用单片机内部的定时/计数器完成待测信号频率的测量。该频率计采用外部分频方式，实现10Hz-500kHz的频率测量，同时可以实现量程自动切换。单片机内部定时/计数器的门控时间方便对频率计的测量。待测频率值通过LCD液晶显示器显示，并可以自动切换量程。本设计具有测量准确度高、响应速度快、体积小等优点，采用了单片机技术设计一种数字显示的频率计。关键词包括周期测频法、单片机控制、软硬件结合。本设计为西安交通大学城市学院本科生毕业设计（论文）。 ABSTRACT This paper introduces a high-precision frequency meter designed using the 51 single-chip microcomputer. Frequency measurement is one of the most basic measurements in electronics. The frequency meter is mainly composed of a signal input and amplification circuit, a single-chip microcontroller module, a frequency division module, and a display circuit module. This design uses the AT89C51 single-chip microcontroller as the control core to complete the counting, decoding, display, and control of the frequency of the signal to be measured. The frequency of the signal to be measured is measured using the internal timer/counter of the single-chip microcontroller. The frequency meter adopts an external frequency division method to achieve frequency measurement in the range of 10Hz-500kHz and can automatically switch ranges. The gate control time of the internal timer/counter of the single-chip microcontroller facilitates the measurement of the frequency meter. The frequency value to be measured is displayed on the LCD liquid crystal display and can automatically switch ranges. This design has the advantages of high measurement accuracy, fast response speed, and small size, and uses single-chip microcontroller technology to design a digital display frequency meter. Keywords include period frequency measurement method, single-chip microcontroller control, and software and hardware integration. This design is the graduation design (thesis) of undergraduate students in Xi'an Jiaotong University City College.