本文介绍了一种基于C51 内核的MCU 系统。该系统的设计采用了面向对象的方法。它 包含了一个典型的单片机系统常用的功能模块:中断扩展、输入、输出控制、数据处理、显示与键盘管理等,给用户提供了一些接口。它具有功能强,效率高的优点,并且缩短了单片机系统开发所需时间。 关键字:面向对象;单片机;单片机系统; Abstract:This paper introduces a kind of system of MCU base on C51 core. The design of this system adopts object-oriented technique. It includes some common function modules of a typical system of single-chip microcomputer:interrupt-extension, I/O control, data process, display & keyboard management etc and provides some interfaces for user. It has virtue of strong function , supernal efficiency and shortens development time of single-chip microcomputer system. Key words:object-oriented;single-chip microcomputer;single-chip microcomputer system;