LED发光二极管显示实验。

　　1、I/O口实验，控制PB口上的发光二极管循环显示。

　　2、内部1 M晶振，程序采用单任务方式，软件延时。

　　3、进行此实验请插上LED短路块。

　　4、此实验让大家认识最基本的IO口输出控制方法-LED light-emitting diode display experiment. 1, I/O port experiments, the control port on the PB cycle of light-emitting diode display. 2, the internal 1 M oscillator, the program single-task mode, the software delay. 3, to conduct this experiment plug in the LED short block. 4, this experiment to make people understand the most basic IO port output control method