它具有计时功能。此秒表有两个按键（reset， start）按下reset键后，秒表清零，按下start键后，开始计时，再次按下start键后， 暂停计时，秒表显示内容闪烁。 用FPGA开发板上的两个七段数码管显示时间（以秒为单位），计时由0 到 59 循环。-It has a timer function. This stopwatch has two buttons (reset, start) reset button is pressed, the stopwatch is cleared, press the start key, start the timer, press the start key again, pause timing, stopwatch display flashes. FPGA development board with two seven-segment digital tube display time (in seconds), time from 0-59 cycles.