该实验设计模60计数器，并通过数码管进行显示，最后实现秒表的功能。7段数码管采用共阴极数码管，如图1所示，当某段接有高电平时该段将发光。-The experimental design mode 60 counters, and through digital tube display, and finally achieve the stopwatch function. 7 digital tube using a total digital cathode tubes, as shown in Figure 1, when a certain period of time then there is high that the paragraph would luminescence.