程序同样控制1个7段显示数码管，但控制的方法是通过访问总线进行显示数据的写操作，属于总线方式的并行数据操作。其中库文件根据不同实验台而不同。-The same program control a 7-segment display digital tube, but the method of control is by visiting the bus display data write operation, the operation of the parallel data bus way. Which library files under different experimental station.