基于51片机的多功能数字时钟设计.doc

山东电力高等专科学校 毕业设计 多功能电子时钟设计 姓名： 贾倩倩 院系： 计量工程系 专业： 电子测量技术与仪器 学号: 0909010242 指导老师：赵保华 提交时间：2011.1 目录 摘要··························································3 一 工作原理······················································4 二 硬件电路设计··············································4 2.1主控制器AT89C51 ····································4 2.2内部时钟电路·········································6 2.3手动复位电路·········································6 三 温度测量及报警部分·······································7 3.1温度测量模块·········································7 3.2 DS18B20的主要特性··································8 3.3 DS18B20的外形和内部结构 ··························8 3.4 高速暂存存储器 ····································10 3.5 DS18B20的应用电路·································11 四 键盘、显示部分···········································12 4.1键盘模块·············································12 4.2显示模块·············································13 4.3 1602LCD的指令说明及时序···························15 五 实时时钟部分··············································17 5.1 DS1302简介 ·······································17 5.2 DS1302的引脚及内部寄存器··························18 5.3 DS1302的控制字节 ·································19 5.4数据输入输出(I/O)···································19 5.5 DS1302 与微控制器的接口软件及功能应用举例·······19 六 软件设计 ·················································19 七 调试与分析················································20 总结和体会 ····················································21 致 谢 ·····················································22 参考文献 ····················································23 附 录 1 ·····················································23 附 录 2 ·····················································24 摘要 多功能数字钟的系统采用AT89C51单片机作为控制系统的核心，模型采用单片机作为主控制器，利用DSl302时钟芯片计算当前的秒、分、时、日、月、年。通过1602液晶屏友好的人机界面将结果完美的呈现给用户。为具有更高的实用价值，特采用DS18B20来显示当前温度，并伴有温度报警功能。利用键盘模块对预设的温度报警上下限进行设置。由于该系统具有时间显示、温度测量等完整功能，有很高的利用价值。 [关键词]温度测量 　单片机　 c