本点阵电子显示出来屏系统以STC89C52单片机SCM作为控制核心，其外围电路包含存储器扩展模块、LED显示出来来电路模块、驱动driver电路模块、PC通信电路模块。其中，控制芯片的行驱动driver用2个74LS138构成4

-This dot-matrix electronic display screen system the STC89C52 SCM SCM as control core, its peripheral circuit includes a memory expansion module, LED display out to the circuit module, driver driver circuit modules, PC communication circuit module. Among them, the control chip line driver driver 2 74LS138