基于单片机的 LED 点阵广告牌设计摘要本设计使用 AT89C51 系列高速单片机作为主控制模块,利用简单的外围电路来驱动 64×16的点阵 LED 显示屏。利用 AT89C51 系列高速单片机本身强大的功能,可以很方便的实现单片机与 PC 机间的数据传输及存储,并能利用软件方便的进行显示内容的多样变化,另一方面点阵显示屏广泛的应用于医院、机场、银行等公共场所,所以本设计具有很强的现实应用性。本 LED 显示屏能够以动态扫描的方式同时显示 4 个 16×16 点阵汉字,并能通过上位机软件修改显示内容和显示效果等等。把字符内码存储在空闲的单片机程序存储器空间,使本 LED 显示系统能掉电存储 1024 个字符。设计中采纳了 SPI 接口的 GB2312 标准字库,支持所有的国标字符和 ASCII标准字符的显示.因为采纳串行传输方式,使本系统的可扩展性得到提升,便于多个显示单元的级联。本文从 LED 的显示原理入手,详细阐述了 LED 动态显示的过程,以及硬件电路的设计、计算和软件的算法。【关键词】 动态显示;单片机;点阵字库Abstract This design uses STC12C series MCU as a main controller, and depends on a simple external circuit to drive 96×16 the lattice LED display. By using its own powerful functions and capacity of internal E2PROM, it is easy to accomplish the MCU and PC and E2PROM for internal storage, data transmission equipment ,and it also can be used conveniently to show a variety of content changes. The other dot matrix display is widely used in hospitals , airports, banks and other public places. Therefore, the design has a strong practical application。 The LED Display dynamic scan can show the way at the same time six 16 × 16 dot matrix Chinese characters, and PC software can modify the content and effect shows, and so on。 IAP used in the application of programmable technology, the characters within the code stored in the SCM free program memory space, so that the LED display system can store 1,024 brown—out characters. SPI used in the design o...