做单一灯的左移右移，硬件电路如图4.4.1所示，八个发光二极管L1－L8分别接在单片机的P1.0－P1.7接口上，输出“0”时，发光二极管亮，开始时P1.0→P1.1→P1.2→P1.3→┅→P1.7→P1.6→┅→P1.0亮，重复循环。 -A single light left to do right, the hardware circuit as shown in Figure 4.4.1, the eight light-emitting diodes L1-L8 are connected to P1.0-P1.7 microcontroller interface, the output " 0" , the LED lights , at the beginning P1.0 → P1.1 → P1.2 → P1.3 → ┅ → P1.7 → P1.6 → ┅ → P1.0 light, repeat cycle.