1、- I - 摘 要 近年来随着计算机在社会领域的渗透和大规模集成电路的发展，单片 机的应用正在不断的走向深入。但是在由单片机构成的实际测控系统中， 最小应用系统往往不能满足要求， 因此在系统设计时首先要解决系统扩 展问题。单片机扩展通常是借助外部器件对系统进行扩展。 本文主要研究了采用可编程多功能扩展芯片 intel 8155 扩展单片机 I/O 口。把单片机作为一个核心部件，设计单片机与 8155 的接口，并实现数码 管三位数字的显示。 本文的主要内容有：单片机的概述，设计的意义，核心器件 intel 8155 芯片、80C51 单片机、数码管的介绍，单元电路模块，设计原理图及流程图， 软件
2、编程设计以及最后的结果和个人在整个设计前后的心得体会。 关键词：关键词：单片机，8155，数码管，动态显示。 Abstract With the development of computer penetration in the social field and LSI in recent years, the application of MCU is constantly deepening. but in the actual measurement and control system constituted by the microcontroller, the smallest
3、applications system often can not meet the requirements, so we have to solve the system expansion. The Microprocessor usually use an external device to relize the expansion of the system. Adopting Intel 8155 which is a kind of programmable multi-function expansion chip,this paper studies the expansi
4、on of MCU parallel I/O port. MCU act as a core component,.we have designed the 8155 chip interface to relize three digital display on LED numerical code tube. The main content of this paper are microcontroller overview of the significance of the design, the core of the device intel 8155 ;80C51 microcontroller, the introduction of LED numerical code tube, the unit circuit module,design schematics and flowcharts, software programming design, the final results and individual feelings and experience
