基于51的单片机的电子时钟设计与实现.doc

摘要 单片机自20世纪70年代问世以来，以其极高的性能价格比，受到人们的重视和关注，应用很广、、、、、、、、、、、、、、、、、，因此得到了广泛的使用。 ABSTRACT Since the 1970 s chip since the advent, with its high cost performance and attention by people and attention, it is widely used and fast development. SCM small volume, light weight, strong anti-jamming capability, environmental demand is not high, low cost, high reliability, flexibility is good, development more easy. Because of the above features, in our country, the microcontroller is widely used in industrial automation control, automatic detection, intelligent instrument and apparatus, household appliances, power electronics, mechanical and electrical equipment, and other aspects, and 51 SCM is the most typical chip and most representative one. The graduation design through to its study, application to AT89S51 chips as the core, with the necessary circuit, design of a simple electronic clock, it by 4.5 V dc power supply, through the electronic tube can show time, adjust the time, thus to learning, the design, the development of software and hardware in the ability. Electronic Clock is a electronic circuit implementation of the when, sub, seconds The figures show the timing device. Electronic clock precision, stability, far more than the old mechanical clock. In this design, we use LED electronic display hours, minutes, seconds, to 24-hour time mode, according to electronic control theory to dynamic display to display, use the 12MHz crystal oscillation pulse, the timer count. In this design, the circuit has a display time of the this function, you can also realize the time adjustment. Electronic clock is its compact, low cost, travel time and high precision, easy to use, features and more, easy integration and loved by the general consumer, so widely used. Key words: Single-chip microcomputer ; AT89S51 目录 1 绪论 1 1.1电子时钟的背景 1 1.2电子时钟的意义 2 1.3电子时钟的应用 2 2 整体设计方案 3 2.1单片机的选择 3 2.1.1多功能 3 2.1.2高效率和高性能 4 2.1.3低电压和低功耗 4 2.1.4低价格 5 2.2单片机电子时钟功能确定 5 2.3 LED显示模块 7 2.4按键模块 7 3 PCB原理图与仿真