本设计采用单片机STC89C52为核心器件来设计秒表，系统实用性强、操作简单。秒表由1个4位一体共阴数码管来显示时间，显示时间为00.00~99.99秒，每秒自动加1。一个按钮实现启动/暂停功能，另一个按钮实现复位功能。按下启动/暂停键则开始计时，再按一下启动/暂停键则暂停，显示当前计时的秒数，按下复位按钮则复位，显示数值为00.00。-This design USES the microcontroller STC89C52 as the core device to design a stopwatch, system practical, simple operation. Stopwatch by a four digital tube to display the time together, a total of Yin, show time is 00.00 ~ 99.99 seconds, automatically add 1 per second. A function of start/stop button, another button reset functions. The start of the timer, press the start/stop button and then press the start/pause button is suspended, display the current time the number of seconds, press the reset button is reset, the display value of 00.00.