8个发光二极管D1~D8分别接在单片机P1.0-P1.7端口上，一个开关接在P3.0上。

要求输出端口输出“0”时，发光二极管亮。

开关闭合时，开始按P0.0+P0.7、P0.1+P0.6、P0.2+P0.5、P0.3+P0.4的顺序依次点亮LED，再按P0.3+P0.4、P0.2+P0.5、P0.1+P0.6、P0.0+P0.7的顺序点亮LED，重复循环。开关断开时，立刻停止点亮指示灯。

开关断开时，立刻停止点亮指示灯。

-Eight light-emitting diodes D1 ~ D8 are respectively connected to the microcontroller P1.0-P1.7 port, a switch connected to the P3.0. Requirements output port " 0" , the LED lights. The switch is closed, began to press P0.0+P0.7, P0.1+P0.6, P0.2+P0.5, P0.3+P0.4 order were lit LED, then P0.3+P0.4, P0.2+P0.5, P0.1+P0.6, P0.0+P0.7 order lit LED, repeat the cycle. When the switch is turned off, immediately stop the indicator lights. When the switch is turned off, immediately stop the indicator lights.