毕业设计-基于AT89S52单片机的LED显示屏系统设计.docVIP

LED点阵显示屏的设计 系 别 信息工程系 专 业 自动化/测控技术与仪器 班 级 B941XXX 学 号 B941XXXXX 姓 名 指导教师 负责教师 摘 要 本设计采用AT89S52单片机作为主控制器，采用LED专用驱动芯片4953和译码器来驱动大小为128×32的LED点阵显示屏。扩展AT29C系列并行FLASH存储器用于存储字符数据和控制信息。扩展外部并行静态RAM，以弥补51单片机内部RAM的不足，协助单片机实现各种滚动显示效果。主控单片机与通信单片机相互配合，完成显示信息和控制参数的更新以及时间和温度信息的实时采集。 系统中的LED显示屏可以同时显示上下两行共16个16×16点阵汉字或一行共4个32×32点阵汉字，并可以实时显示当前的时间和温度，通过上位机软件还可以修改显示内容和显示效果。扩展的并行FLASH存储器，使本LED显示系统能够掉电存储2000个字符。因为每个LED显示单元是相互独立的，并且显示的字符数据是采用串行的传输方式，因此，系统的可扩展性得到了大大的提升，多个显示单元的级联也十分方便。LED点阵显示屏产品不仅可以用于室内环境，还可用于复杂、恶劣的室外环境，具有很强的现实应用性。 关键词：LED点阵；单片机；并行存储；动态扫描 Abstract This design uses AT89S52 MCU as the main controller,uses the special driving chip 4953 and the decoder chip to drive the 128×32 LED dot matrix display monitor. Series of AT29C parallel FLASH memory expansion used to store character data and control information.Expanded external parallel static RAM in order to compensate the shortage of RAM inside the 51-series MCU, the external RAM assisted the Main Control MCU to accomplish each kind of trundle demonstration effect. The coordination between the Main Control MCU and The Communication MCU, update the character data and the control information as well as the time data and the temperature information real-time gathering. This LED display system can display two lines of 16 16×16 lattice Chinese characters or one line of 4 32×32 lattice Chinese characters,the current time and temperature can be displayed by this system,too. The display contents and the effects can be changed through the upper-computer software. Extended parallel FLASH memory, so that the LED display system can save 2000 characters when the power is off. Each LED display unit is independent of each other,and uses the serial transmission mode to display the character data, therefore the extensibility of this system had greatly ascend, multiple LED display units of cascade is very convenient.LED dot matrix display products not only can be used for indoor environment, but also for complex, harsh