程序介绍：利用P1 口通过一定延时轮流产生低电平



输出，以达到发光二极管轮流亮的效果。实际应用中例如：



广告灯箱彩灯、霓虹灯闪烁。

-procedures introduced : P1 mouth through a certain delay alternate low-level output, to achieve LED-rotation effect. Practical applications such as : advertising light boxes lantern lights flashing.