目錄
摘要.............................................................................. - 1 -
目錄.............................................................................. - 3 -
引言.............................................................................. - 4 -
第一章 題目 ...................................................................... - 5 -
1.2、設計目的..................................................................... - 5 -
第二章  單片機發展歷史 ........................................................... - 5 -
2.1三大階段 .......................................................................- 5 -
2.2  如果將8位單片機的推出作為起點 ............................................... - 6 -
2.3  單片機的發展趨勢............................................................. - 7 -
第三章  單片機的組成及特點.........................................................- 9 -
3.1  單片機的組成..................................................................- 9 -
3.2  單片機的特點..................................................................- 9 -
3.3  單片機的分類  ...............................................................- 10 -
第四章 單片機的應用 ..............................................................- 10 -
4.1單片機的應用分類...............................................................- 10 -
第五章  數字種的構成 .............................................................- 12 -
5.1  數字鐘的構成 ................................................................- 12 -
5.2  實驗中所需的器材.............................................................- 13 -
5.3  方案選擇與相關技術...........................................................- 13 -
5.4  AT89C51的單片機簡介 .........................................................- 13 -
5.4.1  主要特性 ................................................................. - 15 -
5.4.2  管腳說明...................................................................- 16 -
5.4.3  振蕩器特性 ................................................................- 20 -
5.4.5  單片機的中斷 ..............................................................- 22 -
5.5   CC4511 集成簡介............................................................ - 25 -
5.5.1  4511集成分析...............................................................- 25 -
5.5.2  4511的邏輯圖...............................................................- 26 -
5.6   LED數碼顯示器簡介.......................................................... - 26 -
5.6.1  LED數碼顯示器的結構 .......................................................- 27 -
5.6.2  LED數碼顯示器有兩種連接方法................................................- 27 -
第六章  電路設計 .................................................................- 27 -
6.1 電路接法..................................................................... - 27 -
6.1.1  晶體振蕩器與AT89C51的接法..................................................- 27 -
6.1.2  單片機復位電路的連接...................................................... - 28 -
6.1.3  單片機AT89C51銀腳的連接 ...................................................- 28 -
6.1.4  譯碼器CC4511的銀腳連接 ....................................................- 29 -
6.1.5   CC4511與共陰極LED的連接方式...............................................- 29 -
6.2 數字鐘電路圖................................................................. - 29 -
第七章 調試過程...................................................................- 31 -
總結..............................................................................- 31 -
參考文獻......................................................................... - 32 -
致謝..............................................................................- 32 -
附錄一：C語言程序.................................................................- 32 -
附錄2:匯編程序 ...................................................................- 43 -

摘要
近年來隨著計算機在社會領域的滲透和大規模集成電路的發展，單片機的應用正在不斷地走向深入，由于它具有功能強，體積小，功耗低，價格便宜，工作可靠，使用方便等特點，因此特別適合于與控制有關的系統，越來越廣泛地應用于自動控制，智能化儀器，儀表，數據采集，軍工產品以及家用電器等各個領域，單片機往往是作為一個核心部件來使用，在根據具體硬件結構，以及針對具體應用對象特點的軟件結合，以作完善。
本次設計中以單片機的發展過程和發展方向為背景，介紹了單片機的輸入輸出的工作原理和操作方法，中斷的工作原理和操作方法。4511的工作原理和操作方法，LED的內部結構。電路設計及調試過程。
 本次做的數字鐘是以單片機（AT89C51）為核心，結合相關的元器件（共陰極LED數碼顯示器、BCD-鎖存/7段譯碼/驅動器CC4511等），再配以相應的軟件，達到制作簡易數字鐘的目的，其硬件部分難點在于元器件的選擇、布局及焊接。
關鍵詞：單片機    AT89C51    共陰極LED數碼顯示器    BCD-鎖存/7段譯碼/驅動器CC4511   
Abstract
In recent years, with computers in the infiltration and the development of large-scale integrated circuits.  SCM application is steadily deepening, as it has strong function, small size, low power dissipation, low prices, reliable, easy to use features, it is particularly suited to and control of the system, increasingly widely used in automatic control, intelligent instruments, gauges, data acquisition, military products and household appliances, and other areas, is often microcontroller as a core component to use, In light of specific hardware architecture, and application-specific software features object combine to make perfect.
The design of a microcontroller development process and the direction of development as the background, the computer's input and output of the working principle and method of operation interrupted the principle and method of operation. 4511, the principle and method of operation, LED internal structure. Circuit design and debugging process.
 The figures do bell on SCM (AT89C51) at the core, Combined with the components (a total of cathode LED digital display, BCD - latch /7 of decoding / actuator CC4511), and factoring in the corresponding software, Easy to produce digital clock purposes, as part of the hardware components is a difficult choice, layout and welding.
Keywords : Single Chip Microcomputer    AT89C51    Total cathode LED figures display    BCD-the lock save/7 the segments translate code/actuator CC4511