1、课程设计说明书 NO.1 摘 要 随着科学技术的不段发展，科技的应用无处不在，由于智能化的广泛 应用，人们的生活变得更加方便，然而在高精尖科技的面前微型计算机的 应用是无处不在的，所以要学好微机原理及其应用。对于本次课程设计， 按要求通过汇编语言设计出计时时钟。 本设计主要运用 8255A 芯片与 8086CPU、74LS138 译码器、七段 LED 显示，实现一个计时时钟。其中 Intel8255A 是微机配套的通用可编程并行 接口芯片，具有三个可编程端口（A 端口、B 端口、C 端口），每个端口 8 条线， 共 24 条 I/O 引脚， 也可分 2组工作， 每组 12 线， 并有三种工作方
2、式： 基本输入/输出方式、单向选通输入/输出方式和双向选通输入/输出方式。 利用这些性能实现计时时钟的功能。 关键字： 计时时钟；可编程端口； 微机原理 ； 译码器；选通方式 课程设计说明书 NO.2 Abstract Along with the science and technology for development, the use of technology is everywhere, due to the wide application of intelligent, the life of people become more convenient, but in adva
3、nced science and technology of micro computer application before is everywhere, so want to learn computer theory and its application. For this course design, according to the requirements through the assembly language design a time clock. This design mainly USES 8255 A chip and 8086 CPU, 74 LS138 de
4、coder, these seven LED display, realize A time clock. Among them Intel8255A is supporting the general microcomputer programmable parallel interface chip, with three programmable port (A port, and A B C port, and port), each port 8 line, A total of article 24 I/O pin, can also be divided into 2 groups work, each group of 12 line, and there are three that work: basic input/output methods, ChanXiangXuan the input/output way and two-way choose the input/output way.
