"基于AT89S52单片机的电子跑表设计与实现"

本次毕业设计的课题是基于单片机的电子跑表设计。设计要求是电子跑表能够显示正确的时间并能作为秒表使用。设计的主要内容包括单片机最小系统（电源电路，复位电路，时钟电路），键盘电路，驱动电路，显示电路和电子跑表的程序设计。选用的单片机型号为AT89S52，采用两片74LS244作为驱动电路，显示采用两个4位一体的七段数码显示管。通过制作实物，编程，下载程序，制作的电子跑表能够实现正确的时间显示，并且可以实时调整时间显示。作为秒表使用时，计时范围为000.0秒到999.9秒，通过检测发现误差不大。 关键词：电子跑表，AT89S52，接口技术 ABSTRACT This graduation project topic is runs the table design based on the monolithic integrated circuit electron. The design requirement is that the electronic stopwatch can display the correct time and can be used as a stopwatch. The main content of the design includes the monolithic integrated circuit minimum system (power supply circuit, reset circuit, clock circuit), keyboard circuit, driving circuit, display circuit and the program design for the electronic stopwatch. The selected monolithic integrated circuit model is AT89S52, and two 74LS244 chips are used as the driving circuit. The display consists of two 4-digit integrated seven-segment digital display tubes. Through the production of physical objects, programming, and program downloading, the electronic stopwatch can display the correct time and can adjust the time display in real time. When used as a stopwatch, the timing range is from 000.0 seconds to 999.9 seconds, and testing has shown that the error is small.