说明：  程序在主程序中没有连续改变小灯的状态，而在开始运行时将其关闭，延时后点亮。实验现象是一只小灯不断闪烁，这是因为程序中启动了看门狗，看门狗时间长度为1 秒，如果1 秒内没有复位看门狗的话，系统将复位。系统复位后再次开启看门狗，1 秒后复位。
(Procedures in the main program there is no continuous change in the status of small lights, and at the beginning of run-time to turn it off, delay after the light. Experimental phenomena is a small light flashes continuously, this is because the process started the watchdog, watchdog the length of time for 1 second, if no one seconds watchdog reset, the system will reset. Open again after system reset watchdog, 1 seconds after the reset.)