基于单片机的计时器设计论文.doc

题目: 基于单片机的计时器设计
系名信息
专业通信工程
年级大四
姓名
指导教师
年月日
摘要
近年来随着计算机在社会领域的渗透和大规模集成电路的发展,单片机的应用正在不断地走向深入,由于它具有功能强,体积小,功耗低,价格便宜,工作可靠,使用方便等特点,因此特别适合于与控制有关的系统,越来越广泛地应用于自动控制,智能化仪器,仪表,数据采集,军工产品以及家用电器等各个领域,单片机往往是作为一个核心部件来使用,在根据具体硬件结构,以及针对具体应用对象特点的软件结合,以作完善。
计时器在日常生活中最常见,应用也最广泛。本次做的计时器是以单片机(AT89C51)为核心,结合相关的元器件(共阳极LED数码显示器、BCD –七段译码/驱动器74LS48等),再配以相应的软件,达到制作简易数子计时器的目的,文章的核心主要从硬件设计和软件编程两个大的方面。硬件电路设计主要包括中央处理单元电路、数码显示电路、键盘电路等几部分组成,软件用C语言来实现。其硬件部分难点在于元器件的选择、布局及焊接。
关键词:单片机AT89S51; 定时器;中断;定时
ABSTRACT
Recent years, the use of single chip is moving toward deeply with the filter puter in the society and the development of the large scale integrated circuit. Single chip is especially equal to the system relation to the control because of its strong function 、small volume、low power consumption、inexpensive price、credibility work and its handy. it is used in the area of automata 、 Intelligent instrument、appearance、data acquisition、production of war industry 、domestic appliance and so on. The single chip is used usually as the centerpiece; it can be perfect bases the specific Hardware infrastructure and aim at the integrated hardware and software device of the plexion.

The timer is the most familiar and widespread in the applications. The single chip is the hardcore in the timer made in this time ,the timer can reach the purpose of facility digital clock with the correlation parts of an mon cathode LED nixie display 、BCD- seven-segment decoder/ drivers74LS48 and so on) and the correspondence software。The heart of the article has two parts, the hardware design and software programmer. the hardware design includes central processing cell circuit、numeral show circuit 、man-machine interface circuit and so on. Software e true with assemble language. The difficulty of the hardware design is the chosen of ponent、lay out and solder。
Keywords: singlechip; AT89S51; timer; interrupt; Timing;
目录
第一章 绪论 5
课题研究背景及意义 5
国内外发展现状 5
本课题研究目标及内容 5
论文安排 5
第二章基于单片机的计时器设计的理论基础及总体方