【正文】 鄭州科技學院 ?？飘厴I(yè)設(shè)計（論文） 題 目 電子 時鐘 的設(shè)計 學生姓名 專業(yè)班級 學 號 所 在 系 指導教師 完成時間 2021 年 3 月 15 日 I 摘 要 單片機自 20 世紀 70 年代問世以來，以其極高的性能價格比，受到人們的重視和關(guān)注，應用很廣 、 發(fā)展很快。單片機體積小 、 重量輕 、 抗干擾能力強 、 環(huán)境要求不高 、價格低廉 、 可靠性高 、 靈活性好 、 開發(fā)較為容易。由于具有上述優(yōu)點，在我國，單片機已廣泛地應用在工業(yè)自動化控制 、 自動檢測 、 智能儀器儀表 、 家用電器 、 電力電子 、機電一體化設(shè)備等各個方面，而 51 單片機是各單片機中最為典型和最有代表性的一種。這次畢業(yè)設(shè)計通過對它的學習 、 應用，以 AT89S51 芯片為核心，輔以必要的電路，設(shè)計了一個簡易的電子時鐘，它由 ，通過數(shù)碼管能夠準確顯示時間，調(diào)整時間，從而到達學習 、 設(shè)計 、 開發(fā)軟 、 硬件的能力。 關(guān)鍵詞 單片機 / AT89S51/數(shù)碼管 電子時鐘的設(shè)計 Design of the singlechip electronics clock Abstract Single slice machine from published in 7039。s for 20 centuries, is pare with its very high function price, is value by people and pay attention to, apply very widely, develop very quickly. Single slice the machine physical volume is small,the weight is light,the anti interference ability is strong,the environment haven39。t high request,the price is cheap,the credibility is high,vivid good,develop more easy. In order to having an abovementioned advantage, at the our country, single slice the machine is broadly applied already to turn an equipment at industrial automation control,automatic examination,intelligence instrument appearance,home appliances,electric power electronics,the machine electricity integral whole etc. each aspect, but 51 machines is is a typical model most and have a representative most in each machine of a kind. This graduation design passes to its study and application, Take the AT89S51 chips as core, assist with the electric circuit of the necessity, design a simple electronics clock, it from the V direct current power supply power supply, pass the figures tube can accurate manifestation time, adjust time。 Arrive a study and design, develop thus soft,the ability of the hardware . KEY WORDS SCM, AT89C2051, digital displays I 目 錄 摘 要 ........................................................................................................................ I Abstract.......................................................................................................................... II 目 錄 .............................................................................................................................. I 1 引言 .......................................................................................................................... I 2 關(guān)于電子時鐘 ........................................................................................................III 電子時鐘簡介 ............................................................................................III 電子時鐘的基本特點 .................................................................................III 電子時鐘的原理 .........................................................................................III 3 關(guān)于單片機 ........................................................................................................... IV 單片機簡介 ................................................................................................ IV 單片機的發(fā)展史 ........................................................................................ IV 4 位單片機 .................................................................................... IV 8 位單片機 .................................................................................... IV 16 位單片機 ....................................................................................V 32 位單片機 ....................................................................................V 64 位單片機 ....................................................................................V 單片機的特點 ..............................................................................................V 4 方案 論證與比較 .................................................................................. VII 數(shù)字時鐘方案 ........................................................................................... VII 5 系統(tǒng)設(shè)計 ............................................................................................................... IX 總體設(shè)計 .................................................................................................... IX 計時方案 ....................................................................................... IX 控制方案 ....................................................................................... IX 具體設(shè)計分析 ............................................................................... IX 模塊設(shè)計 ..................................................................................................... X 芯片分析 ........................................................................................... X 電子時鐘的設(shè)計 AT89S51 芯片 ............................................................................. X ： RD，外部數(shù)據(jù)存儲器的讀取信號。 ........................................... XIII 74LS47 ................................................................................... XIII 74LS138 ...................................................................................XIV 晶振電路 ...............................................................................................XVI 圖 3 晶振電路 ...........................................................................................XVI 復位電路 ............................................................................................. XVII 數(shù)碼顯示模塊設(shè)計 ............................................................................. XVII 按鍵模塊 .............................................................................................. XVIII 整個電路原理圖 ..........