说明：  采用STC89C58，595做列扫描，行扫描直接采用单片机IO口，实现汉字滚动显示。点阵为16*64，可扩展
(Using STC89C58, 595 to do the column scanning, line scanning microcontroller IO port used directly to achieve character scrolling display. Lattice is 16* 64, scalable)