文档介绍：目录
摘要 1
Abstact
第1章绪论
电子钟的发展史 4
设计的目的与意义 4
设计的基本思路与主要内容 5
第2章时钟系统的整体设计 6
6
整体方案 6
第3章硬件设计与分析 8
硬件设计原理 8
8
AT89S52单片机介绍 8
8
9
键盘及其接口 9
系统原理图 10
第4章软件设计 12
程序流程图 12
程序清单 13
第5章调试与运行 错误!未定义书签。
电路仿真 错误!未定义书签。
调试和运行 错误!未定义书签。
第6章结论 26
致谢 27
参考文献 28
基于AT89S52单片机的数字钟设计
作者
指导老师
摘要:近些年,人们对数字钟的要求越来越高,传统的时钟已不能满足人们的需求。多功能数字钟不管在性能还是在样式上都发生了质的变化,如电子闹钟、数字闹钟等。单片机在多功能数字钟中的应用已是非常普遍,人们对数字钟的功能及工作顺序都非常熟悉,但是却很少知道他的内部结构以及工作原理。由单片机作为数字钟的核心控制器,可以通过它的时钟信号进行计时,实现数字钟表的各种功能,将其时间数据经单片机输出,利用显示器显示出来。通过键盘可以定时、校时。输出设备显示器可以为液晶显示器或数码管。本次做的数字钟是以单片机(AT89S52)为核心,结合相关的元器件(共阴极LED数码显示器、8路同相三态双向总线收发器74LS245 / 6非门反相器74LS04等),再配以相应的软件,达到制作简易数字钟的目的,其硬件部分难点在于元器件的选择、布局及焊接。P0口要直接驱动8位LED是不够的,我们通过两片74LS245对功率进行放大,如果没有,LED管将不能正常显示。
关键词:单片机    AT89S52    共阴极LED数码显示器  
Based on the digital clock AT89S52 SCM design
Author linzhangbing
Guidance teacher huyonggang
Abstract: in recent years, people on a digital clock and taller to the requirement of the clock, the traditional already cannot satisfy people's needs. Multi-function digital clock no matter in style in performance or have undergone a qualitative change, such as electronic alarm clock, digital alarm clock, etc. puter in the application of multi-function digital clock already are mon, people on a digital clock function and working order are very familiar with, but few know his internal structure and working principle. By single chip puter as a digital clock core controller can through its clock signal timing, realizing the functions of digital clock, its time data SCM outputs, using monitors displayed. Through the keyboard can timing, school. Output device for LCD monitors can or digital tube. This do a digital clock is AT89S52 SCM () as the core, combining ponents (total LED digital display, cathode in three states with eight road bidirectional bus transceiver 74LS245/6 74LS04 sr inverter, etc), match again with the corresponding