四 川 理 工 学 院 毕 业 设 计 基于单片机的数字频率计设计( 创新的自动选当功能)基 于 单 片 机 的 数 字 频 率 计 设 计摘 要：一个基于单片机的数字频率计设计，系统硬件主要包括整形电路（由74LS00斯密特触发器组成），分频器74LS161 、多路选择器74LS151 、与非门74LS00组成的分频模块，控制电路（由AT89C52单片机组成）， LED数码管和显示电路。能根据输入信号自动切换量程，可以测量方波、三角波及正弦波等多种波，结构简单，操作方便，价格低廉，适用于日常生活和生产、计算机、通讯设备、音频视频等科研生产领域。 关键词：单片机；数字频率计；定时器；计数；测量；AT89C52Design of digital frequency meter based on single chip microcomputerAbstract：The hardware system includes shaping circuit (consisting of 74LS00 Schmitt trigger), frequency module frequency divider 74LS161, 74LS151, 74LS00 MUX NAND gate, control circuit (composed of AT89C52 single chip computer), LED digital tube and display circuit. The software includes control of the main program and interrupt service subroutine, digital transformation procedures and display program. According to the input signal automatic switching range, can be measured in square wave, triangular wave and sine wave, wave, simple structure, convenient operation, low price, suitable for daily life and production, computer, communications equipment, audio video and other fields of scientific research and production.Keywords: single chip microcomputer; digital frequency meter; timer; counter; measurement; 89C52目 录第1 章 引言................................................................................................11.1 数字频率计的进展和意义........................................................................11.2 数字频率国内外的进展形势....................................................................11.3 本章小结...............................................................................................
