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Control Board of the LED Screen Based on CPLD

Tong Xing Xiong Wenlong(School of Computer Science and Technology,WUT,Wuhan 430063)  
The principle of LED screen and the design of software and hardware are introduced in the paper.The frame of system is established based on the principle.The hardware of control board is made up of CPU(8 9C51) and CPLD(EPM71 28SLC8).The software in 89C51 receives Unicode through R S232 from PC,then searches Chinese-characters to gain the data for LED screen.The software in 89C51 outputs the data to LED screen continuously.EPM7128SLC8,that integrates the peripheral interface logic unit to the LED screen,implements the function of shifting data and row scanning.It lightens the tasks of 89C51.The new design is flexible and steady,and the new Control-board refreshes faster than the old mode.
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