微机原理和接口技术是一门实践性强的学科，不但要求有较高的理论水平，而且还要求有实际的动手能力，其中很多的原量、规则、现象等仅仅靠学习教科书是无法完全掌握的，必须通过实践才能比较直观和深刻的理解。本课程设计任务和目的是：帮助学生巩固和加深理解所学的理论知识，训练学生的实验技能，使其树立工程观点和严谨的科学作风，初步具有运用理论知识分析问题、解决问题的能力。培养学生运用所学的理论解决实际问题的能力，使学生初步掌握分析简单电路，调试简单汇编程序以及撰写实验报告的能力。

十字道口的红绿灯是交通法规的无声命令，是司机和行人的行为准则。十字道口的交通红绿灯控制是保证交通安全和道路畅通的关键。当前，国内大多数城市正在采用“自动”红绿交通灯，它具有固定的“红灯—绿灯”转换间隔，并自动切换。本次关于交通灯的课程设计通过8255A控制交通灯在东西、南北方向红灯—绿灯—黄灯转换的的状态,当出现紧急状况时，触发8255A的PC口PC7上的紧急触发开关，使东西南北方向灯全为红。

-Microcomputer Principle and Interface Technology is a strong practical discipline, not only ask for a higher theoretical level, but also requires practical ability,

Many of the original amount, rules, phenomena alone can not fully grasp the textbook learning, and practice must be more intuitive and profound

Understanding. Design task and objectives of this course are: to help students consolidate and deepen understanding of the theoretical knowledge, practical skills training for students, so the tree

Engineering perspective and rigorous set of scientific style, with a preliminary analysis of the use of theoretical knowledge and solve problems. Students learn to apply the rationale

On the ability to solve practical problems, to enable students to initially master the simple circuit analysis, debugging and writing simple assembler test reports.

Cross the traffic lights crossing traffic laws is a silent command, the code of conduct for drivers and pedestrians. Cross the traffic