秒表计时器的设计与制作

摘要

基于单片机STC89 C52设计了一款4位秒表计时器。该秒表计时器具有计满报警,计时清零,暂停计时和回显计时等功能,主要由按键模块、显示模块和蜂鸣器报警模块构成,由74 LS138译码器译码后控制数码管位选,P2口控制段选,实现从“0000”秒计时到“9999”秒的显示,适合于时间精度要求较高的场合。%A kind of four digits stopwatch timer is designed by using a STC89C52 SCM as its core. The main functions of the stopwatch are full alert, time zero, pause time and return time, which are made of key module,display module and buzzer alarm module. By 74LS138 decoder decoding control digital tube position section, P2 control segment section. The stopwatch can reckon by time from “0000”seconds to “9999” seconds, which is suitable for occasions with higher accuracy requirements.