"基于单片机的数字频率计设计：信号处理与显示"

本本科毕业论文于2008年4月24日完成，题为"基于单片机的数字式频率检测装置设计"，旨在利用AT89S52单片机作为核心，充分利用硬件资源设计一种频率计。该频率计首先将被测信号放大整形处理，变成满足单片机I/O口接受的TTL/CMOS兼容信号，然后将其输入至单片机的T1输入口直接累加脉冲数。同时，单片机内部定时器定时为1秒，这时累加的脉冲数即为被测信号的频率。最后，经单片机处理后送至LCD液晶显示屏显示。本设计的关键字包括单片机（AT89S52）、放大整形、数据处理以及1602aLCD。 This undergraduate thesis, completed on April 24, 2008, is titled "Design of Digital Frequency Detection Device based on Single Chip Microcomputer." The aim of this thesis is to design a frequency meter by utilizing the AT89S52 single-chip microcomputer as the core and making full use of hardware resources. The frequency meter first amplifies and shapes the measured signal, turning it into a TTL/CMOS compatible signal that can be accepted by the single-chip microcomputer's I/O port. The signal is then input into the T1 input port of the single-chip microcomputer for direct accumulation of the pulse count. Meanwhile, the internal timer of the single-chip microcomputer is set to 1 second, during which the accumulated pulse count represents the frequency of the measured signal. Finally, the processed data is sent to the LCD liquid crystal display for presentation. The keywords of this design include single-chip microcomputer (AT89S52), amplification and shaping, data processing, and 1602aLCD.