具有一定的抗干扰能力；利用单片机内部定时器中断实现自动计数；数码管显示当前计数值；独立按键实现对计数的加减，暂停，继续，清零等设置操作。当按键按下，蜂鸣器发出声音。-Anti-jamming capability　MCU internal timer interrupt automatic count　digital display the current count value　individual keys to the addition and subtraction, counting, pause, continue, clear set operation. When the button is pressed, the buzzer sound. ?