毕业设计-基于AT89S51单片机的电子时钟设计.doc

郑州科技学院 专科毕业设计（论文） 题 目 电子时钟的设计 学生姓名 专业班级 学 号 所 在 系 指导教师 完成时间 2011 年 3月 15 日 摘 要 单片机自20世纪70年代问世以来，以其极高的性能价格比，受到人们的重视和关注，应用很广、、、、、、、、、、、、、、、、、Design of the singlechip electronics clock Abstract Single slice machine from published in 70s for 20 centuries, is compare with its very high function price, is value by people and pay attention to, apply very widely, develop very quickly. Single slice the machine physical volume is small,the weight is light,the anti- interference ability is strong,the environment havent high request,the price is cheap,the credibility is high,vivid good,develop more easy. In order to having an above-mentioned advantage, at the our country, single slice the machine is broadly applied already to turn an equipment at industrial automation control,automatic examination,intelligence instrument appearance,home appliances,electric power electronics,the machine electricity integral whole etc. each aspect, but 51 machines is is a typical model most and have a representative most in each machine of a kind. This graduation design passes to its study and application, Take the AT89S51 chips as core, assist with the electric circuit of the necessity, design a simple electronics clock, it from the 4.5 V direct current power supply power supply, pass the figures tube can accurate manifestation time, adjust time。Arrive a study and design, develop thus soft,the ability of the hardware . KEY WORDS SCM, AT89C2051, digital displays 目 录 摘 要 I Abstract II 目 录 I 1 引言 I 2 关于电子时钟 III 2.1 电子时钟简介 III 2.2 电子时钟的基本特点 III 2.3 电子时钟的原理 IV 3 关于单片机 IV 3.1 单片机简介 IV 3.2 单片机的发展史 IV 3.2.1 4位单片机 IV 3.2.2 8位单片机 V 3.2.3 16位单片机 V 3.2.4 32位单片机 V 3.2.5 64位单片机 VI 3.3 单片机的特点 VI 4 方案论证与比较 VII 4.1 数字时钟方案 VII 5 系统设计 IX 5.1 总体设计 IX 5.1.1 计时方案 IX 5.1.2 控制方案 IX 5.1.3 具体设计分析 X 5.2 模块设计 X 5.2.1芯片分析 X 5.2.1.1 AT89S51芯片 X P3.7：RD，外部数