系统板调试实现计数显示功能，利用LED动态显示电路实时显示当前计数值，计数脉冲信号由P3.3输入，计数值最大为100，溢出后清零。 -Counting system board to achieve display debugging, using real-time LED display circuit dynamically displays the current count value, counting pulse signal from the P3.3 input, counts up to 100, after the overflow is cleared.