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介绍一种以 89C5 2单片机为控制核心 ,采用 1 6路动态扫描方式进行显示的 LED大屏幕显示系统的设计方案 .系统使用了两个帧显示缓冲区 A和 B,单片机在向 A区写入显示数据的同时 ,用一个地址自动生成器产生 B区的地址信号并自动读出 B区的数据送给显示屏 ,A和 B区的读写过程同时且交替进行 ,用普通单片机实现了较大面积的 LED显示 .该系统与PC机通过串行通信进行数据的更新 ,并可脱离上位计算机独立工作 ,以多种播出方式显示各种字体和字型的文字、数字信息 .本系统已在现场获得应用
This paper introduces a design scheme of LED large screen display system with 89C5 2 MCU as its control core and 16 dynamic scanning mode.The system uses two frames to display buffers A and B. The MCU writes to A Display data at the same time, with an address generator to generate the B area address signal and automatically read the B area data sent to the display, A and B area read and write process at the same time and alternately, using a common microcontroller to achieve a larger Area of the LED display. The system and PC through serial communication data update, and can work independently from the host computer to a variety of broadcast to display a variety of fonts and fonts of text, digital information. The system has been Field access applications