AT89S51单片机实现多功能数字钟

论文编号:DZXX274  论文字数:12878,页数:35

摘要

 本次毕业设计主要通过用AT89S51单片机实现多功能数字钟的制作来达到学习与设计的目的，主要是对单片机的定时器、中断这两个重要概念的进行相关的的学习与设计，从而来提高自身的软、硬开发能力。
 单片机做为嵌入式系统的一个重要部分，同时也是计算机的一个重要分支。在计算机中，把包含运算器和控制器的IC称为CPU(Central Processor Unit)，而为了进一步缩小PCB板的面积以适合于一些特殊场合的需要，提高系统可靠性，将输入、输出接口电路、时钟电路以及存储器、运算器和控制器集成在一个CPU芯片内，就成了单片机（也称为微控制器）。单片机即微控制器(Micro Controller Unit)。单片机不是完成某一个逻辑功能的芯片，而是把一个计算机系统集成到一个芯片上。概括的讲：一块芯片就成了一台计算机。它的体积小、重量轻、价格便宜、为学习、应用和开发提供了便利条件。同时，学习使用单片机是了解计算机原理与结构的最佳选择。而51系列单片机是各单片机中最为典型和最有代表性的一种。
 本次毕业设计所设计的数字钟为杭州万吉达电子有限公司生产的数码相机中的部分功能模块，本人参与了产品相关功能模块的设计与调试。
 
关键字：单片机，AT89S51，数字钟

ABSTRACT

 This graduation design mainly is to manufacture a multi-purpose digital clock through using the AT89S51 MCU. In order to study and design a MCS-51 system. The mainly purpose is to study and applicant the MCS-51's timer and the interrupt, Thus to improve my design of the software and hardware.
 Single Chip Microprocessor is one of the most important of the embedded system, It is also an important branch of the computer. In the computer, the IC which contains the logic unit and controller is called CPU(Central Processor Unit).but in order to reduce the area of the PCB board. Enhanced the system reliability. put the input and the output interface electric circuit、the clock electric circuit and the memory, the logic unit and the controller integration in a CPU chip, then the single chip is became the Micro Controller Unit(we can also call it as a Micro Processor Unit).the MCU is not a IC that completes some logical function, it integrates a whole computer system on the chip. Summary Speaking; A MCU is a small computer. it has small volume, light weight, and its price is cheap. all these has provided the convenient condition for the study, the application and the development. At the same time, the study of using the MCU is the best choice of understanding the computer principle and the structure. And the MCS-51 is one of the most typical and the representation MCU.
 This digital clock of the graduation design is designed for the digital camera which is produced by the (hang Zhou) D-MAX electronic LTD. And I take part in the design and debug of the product.

Keywords: Single Chip Microprocessor，AT89S51，Digital Clock

目  录

摘要  I
ABSTRACT II
第1章 绪论 - 1 -
 1.1 选题背景 - 1 -
 1.2 研究内容 - 3 -
第2章 AT89S51简介 - 4 -
 2.1 主要性能参数 - 4 -
 2.2 功能特性概述 - 5 -
 2.2.1 引脚功能说明 - 5 -
 2.2.2 特殊功能寄存器 (SFR)介绍 - 7 -
 2.3 小结 - 8 -
第3章 系统设计与分析 - 9 -
 3.1 系统分析 - 9 -
 3.2 技术方案 - 9 -
 3.2.1  LED数码管 - 9 -
 3.2.2  译码器的选择 - 10 -
 3.2.3  外部中断扩展芯片的选择 - 11 -
 3.3 关键技术 - 12 -
 3.3.1  单片机复位电路与晶振电路 - 12 -
 3.3.2  LED的驱动和显示 - 13 -
 3.3.3  LED片选电路的设计 - 14 -
 3.3.4  定时器的使用 - 15 -
 3.3.5  外部中断控制电路 - 16 -
 3.4 相关功能模块程序 - 19 -
 3.4.1 主程序 - 19 -
 3.4.2 复位程序 - 20 -
 3.4.3 显示程序 - 23 -
 3.5 误差分析 - 25 -
 3.6 小结 - 26 -
第4章 结果分析及未来展望 - 27 -
第5章 结论 - 28 -
致谢  - 29 -
参考文献 - 30 -
附录1 电路图 - 31 -

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