【正文】 畢業(yè)論文（設(shè)計(jì)） 摘要 隨著單片機(jī)技術(shù)的飛速發(fā)展，在其推動下，現(xiàn)代的電子產(chǎn)品幾乎滲透到了社會的各個領(lǐng)域，有力地推動了社會生產(chǎn)力的發(fā)展和社會信息化程度的提高，同時也使現(xiàn)代電子產(chǎn)品性能進(jìn)一步提高。 時間對于人們來說總是那么的寶貴，可以說時間和金錢是劃上了等號。準(zhǔn)確的掌握時間和分配時間對人們來說至關(guān)重要。因此采用單片機(jī)為主的數(shù)碼管為顯示器的電子時鐘就體現(xiàn)出了很大的優(yōu)勢。電子鐘的設(shè)計(jì)方法有很多種，但利用單片機(jī)制作的電子時鐘更具有編程靈活、便于電子功能的擴(kuò)充、精確度高、便于攜帶、顯示直觀等特點(diǎn)。 通過利用 MCS51 單片機(jī) 內(nèi)部的定時器 /計(jì)數(shù)器功能來實(shí)現(xiàn)電子時鐘的計(jì)時方法。主要由 AT89S51 芯片和 LED 數(shù)碼顯示管為核心，構(gòu)成了一個單片機(jī)電子時鐘。 關(guān)鍵詞 ： 單片機(jī)， AT89S51，電子時鐘， LED 畢業(yè)論文（設(shè)計(jì)） Abstract With the rapid development of microputer technology in its promotion, modern electronics into almost all areas of society, a strong impetus to the development of social productive forces and social improvement in the level of information, but also to further improve the performance of modern electronic products. Time is always so valuable for people who can say that time and money is the eq ual sign. Accurate grasp of time and allocation of time is crucial to people. Therefore, the digital control based on microputerbased electronic clock on the display reflects a great advantage. Clock Design There are many ways, however, produced by single chip electronic clock is more flexible programming, and easy expansion of electronic capabilities, high accuracy, easy to carry, display visual and so on. In this paper, through the use of MCS51 microcontroller39。s internal timer / counter function to implement the electronic clock timing method. Mainly by the AT89S51 chip and LED digital display tube as the core, forming a single chip electronic clock. Key word: Monolithic integrated circuit， AT89S51， Electronic clock， LED 畢業(yè)論文（設(shè)計(jì)） 目錄 1 前言 ............................................................................................................................ 1 概述 .................................................................................................................. 1 研究目的 .......................................................................................................... 1 2 單片機(jī)概述 ................................................................................................................ 2 單片機(jī)的概念 .................................................................................................. 2 單片機(jī)的發(fā)展史和發(fā)展趨勢 .......................................................................... 2 單片 機(jī)的發(fā)展歷史 ................................................................................ 2 單片機(jī)的發(fā)展趨勢 ................................................................................ 3 單片機(jī)的特點(diǎn) .................................................................................................. 3 MCS51 單片機(jī)的基本結(jié)構(gòu) ............................................................................ 3 MCS51 單片機(jī)的基本組成 .................................................................. 3 AT89S51 單片機(jī)的引腳 ......................................................................... 5 3 系統(tǒng)設(shè)計(jì) .................................................................................................................... 6 設(shè)計(jì)方法及原理 .............................................................................................. 6 設(shè)計(jì)方法 ................................................................................................ 6 電子時鐘原理 ........................................................................................ 6 數(shù)碼管顯示原理 .................................................................................... 6 總體設(shè)計(jì) .......................................................................................................... 7 系統(tǒng)說明 ................................................................................................ 7 系統(tǒng)框圖 ................................................................................................ 7 模塊設(shè)計(jì) .......................................................................................................... 8 電源部分 ................................................................................................ 8 復(fù)位電路 ................................................................................................ 8 數(shù)碼管的連接電路 ................................................................................ 9 控制部分 .............................................................................................. 10 4 軟件設(shè)計(jì) .................................................................................................................. 11 程序流程圖 .................................................................................................... 11 畢業(yè)論文（設(shè)計(jì)） 源程序 ............................................................................................................ 13 中斷入口程序 ...................................................................................... 14 主 程 序 .............................................................................................. 15 1 秒計(jì)時程序 ........................................................................................ 15 閃動調(diào)時程序 ...........