With the social progress and development of industrial technology，the concept of time migrate towards media time after natural time and clock time. In the information society，the traditional clocks has been in the crisis, but moulds duty of the new time media sense to fall on the electron ones. By the time the reorganization of our daily lives, electronic media not only detracts from the time of reference, but also through the dissemination of technology and content to create a transient, fragmented and characterized by disordered media time, to change the time of human perception, this new concept of time will be social development and human life is more profound impact.
The core of this design is AT89S51 which is the monolithic integrated circuit system that can carry on timing. The image of light-emitting diode through the system to achieve the function of time.The light-emitting diode is one kind of semiconductor solid luminescent device, which takes the luminescent material using the solid semiconductor chip.The light-emitting diode occurs in the semiconductor through the current carrier compound emits the surplus energy to cause the photon emission. Therefore I believe this system in the time function is useable, simplicity of operator and extended.
Keywords: media time，time function，light-emitting diode
目录
摘要 I
ABSTRACT II
第1章 引言 1
1.1 背景 1
1.2 研究内容 1
第2章 相关知识 2
2.1 单片机技术 2
2.1.1 单片机的介绍 2
2.1.2 常见单片机芯片介绍 3
2.1.3 单片机AT89S51 4
2.2 高压大电流达林顿晶体管 6
2.3 调试环境 7
2.4 仿真环境 8
第3章 系统硬件设计 11
3.1 总体方案 11
3.2 各功能块介绍 11
3.2.1 主控制器 11
3.2.2 其他功能电路 12
第4章 系统软件设计 15
4.1 主程序流程图 15
4.2 各个软件模块设计 15
4.2.1 时间计算子程序 15
4.2.2 按键读取程序 16
4.2.3 显示程序流程图 16
第五章 系统测试 17
5.1 系统硬件调试 17
5.2 系统软件调试 17
第六章 结束语 18
致谢 19
参考文献 20
附录A 基于单片机的电子沙漏实物图 21
附录B源代码 22
