[毕业论文]分秒电子计时器.docVIP

分秒电子计时器 摘 要 现在科技越来越发达，竞争越来越激烈，运用时间越来越精密，电子时钟的设计成为现在社会的一大热门。由单片机为主设计的电子时钟设计,它由4按键输入电路,时钟电路,蜂鸣电路,复位电路,单片机,LED显示器段码驱动电路,4位LED显示电路所组成。本次设计单片机部分分别进行了程序设计,设计本身是为了让大家熟悉自己所学,把知识用于实际的过程,通过这个设计,大家可以熟悉单片机各方面的优点,也是我选择单片机完成本设计的原因,设计中,需要数电、模电、单片机、一些相关软件的操作以及相关知识。 关键词： 单片机；LED显示器；AT89C2051；ULN2003 The electronic clock design Abstrac The present science and technology to be more and more developed, The competition will more next month be intense, The time taken to deliver will be more and more precise, Electronic clock design into present society one big popular.Electronic clock design primarily designs which by the monolithic integrated circuit, it by 4 pressed key input circuit, the clock electric circuit, the buzzing electric circuit, repositions the electric circuit, the monolithic integrated circuit, the LED monitor section code actuation electric circuit, 4 LED display circuit composes. This design monolithic integrated circuit part has carried on the programming separately, designs itself is in order to let everybody be familiar with oneself studies, uses in the knowledge the actual process, through this design, everybody may be familiar with the monolithic integrated circuit various aspects the merit, Also is I chooses the monolithic integrated circuit cost design the reason, In the design, needs to count the electricity, The mold electricity, the monolithic integrated circuit, Some correlation software operation as well as the related knowledge. Key word: Monolithic integrated circuit; LED monitor; AT89C2051; ULN2003 目 录 1 引 言 2 2 方案论证 3 3 硬件电路的设计 4 3.1 硬件电路的设计方案及框图 4 3.3 时钟电路的设计 5 3.4复位电路的设计 5 3.5 LED显示电路设计 6 3.5.1 LED显示器的选择 6 3.5.2 LED的段驱动芯片的选择 8 3.5.3 LED的位驱动芯片选择 8 3.5.4 LED驱动电路和单片机的连接 8 3.6 按键电路 8 3.7 蜂鸣电路设计 9 3.8 电源部分 10 4 软件设计方案 11 4.1 系统软件设计方案框图 11 4.2 主程序设计 11 4.2.1 主程序设计框图 12 4.2.2 时钟计时程序设计框图 13 4.2.3 键盘接收子程序的设计 14 5 安装与调试 15 5.1 系统硬件调试 15 5.2 软件调试 15 总 结 16 致 谢 17 参 考 文 献 18 附 录电子时钟原理图………………………………………………………………19 1 引 言随着微电子技术和超大规模集成电路技术的发展，单片微型计算机以其体积小、性价比高、功能强