毕业设计（论文）-基于单片机的倒计时装置设计精选.doc

基于单片机的倒计时装置设计 摘 要 装置 单片机往往是作为一个核心部件来使用，仅单片机方面知识是不够的，还应根据具体硬件结构，以及针对具体应用对象特点的软件结合，以作完善。本篇论文讨论了简单的倒计时器的设计与制作 ，此设计是单片机的电路电路 Design of countdown device based on single chip microcomputer Abstract Singlechip countdown device is widely used in every field of life and production, every circuit automatic control requirements will figure chip design; MCU application technology has become a new technology in the engineering application, MCU application to product miniaturization, multifunction and intelligence, to improve the work efficiency, reduce labor intensity, improve product quality, reduce the consumption of energy and materials to ensure safety. But the meaning of SCM application not only wide range of it and brought the economic benefits, more important significance lies in: the application of SCM is fundamentally changing the traditional control system design concept and the design method. SCM is often used as a core component, only SCM knowledge is not enough, it should be based on the specific hardware structure, as well as the specific application of the characteristics of the software combined with the software to improve. This paper discusses the design and fabrication of a simple countdown timer, this design is MCU countdown device design, the device using AT89C51 microcontroller as the core controller of the countdown timer, for applications that need a countdown of time to adjust the countdown function. The minutes and seconds are two digital display, keyboard set in advance to countdown time, button to start the countdown device, digital tube dynamic display countdown screen, when the countdown to zero, sound, indicated the end of the countdown. Key words: single chip microcomputer AT89c51; display circuit; digital tube; clock circuit; countdown timer 目录摘 要 I 关键词 I Abstract II 目录 III 1 1.1 课题的学术背景及其实际意义 1 1.2 相关领域的成果 1 1.3 课题来源及主要研究内容 1 第二章 设计原理 3 2.1 设计要求 3 2.2 工作原理 3 2.3 程序设计与方案论证 3 2.4系统框图 4 第三章 器件的选择及介绍 5 3.1 单片机AT89C51 5 3.1.1 主要功能特性 5 3.1.2 AT89C51