设计了用于嵌入式系统的大规模液晶显示单元,显示模块选用STN6448D-4K。采 用MCS-51 单片机实现显示模块的RS-232 串行接口扩展,使显示模块与系统接口简单,通过串行命令实现显示点、线、汉字等基本操作。为适应较复杂的界面显示应用,还采用C 语言编写了具有消息驱动机制的简单通用图形用户界面(GUI)程序。 关键词:液晶显示、嵌入式系统、RS-232、图形用户界面 Abstract:A design of large-scale LCD display unit for embedded-system is given, using the LCD module STN6448D-4K. Extending an RS-232 interface with an MCS-51 MCU made the module easily connected to the system. Through the RS-232, commands were sent to display dots, lines, Chinese characters, etc. A simple Graphic User Interface based on message-driven was programmed in C language for more complex application. Key Words: LCD Embedded-system RS-232 GUI