【正文】 ii 山東農業(yè)大學 畢 業(yè) 論 文 基于 51 單片機的四路搶答器設計 院 部：機械與電子工程學院 專業(yè) 班級 ： 10 級自動化 1 班 屆 次： 14 屆 學生姓名： 吳新春 學 號： 20202009 指導教師：劉平 二〇一四年五月二十七日 ii 摘要 .........................................................................................................................I Abstract............................................................................................................... II 引言 ........................................................................................................................ 1 1 系統(tǒng)概述 ............................................................................................................. 2 搶答器需求分析 ...................................................................................... 2 搶答器工作過程 ..................................................................................... 2 2 單片機功能簡介 ................................................................................................ 3 STC89C51 的功能 ................................................................................... 3 STC89C51 特殊功能寄存器 ................................................................ 3 STC89c51 單片機的內部結構 ............................................................... 5 3 系統(tǒng)硬件電路的設計 ........................................................................................ 6 系統(tǒng)總電路如圖 ..................................................................................... 6 最小系統(tǒng)的設計 ..................................................................................... 7 電源的設計 .......................................................................................... 7 時鐘頻率電路的設計 .......................................................................... 7 復位電路的設計 .................................................................................. 9 顯示電路的設計 ................................................................................... 11 數(shù)碼管簡介 ........................................................................................ 12 CD4511 七段譯碼器簡介 .................................................................. 12 按鍵電路的設計 ................................................................................... 14 蜂鳴器設計 ........................................................................................... 15 元器件焊接及調試 ................................................................................ 17 4 系統(tǒng)軟件的設計 .............................................................................................. 17 延時子程序 ........................................................................................... 19 顯示子程序 ........................................................................................... 19 倒計時加按鍵掃描子程序 ................................................................... 19 主程序及分析 ........................................................................................ 20 5 結論 .................................................................................................................. 23 參考文獻 .............................................................................................................. 24 致謝 ...................................................................................................................... 25 附錄 1.................................................................................................................. 26 附錄 2................................................................................................................... 27 ii Contents Abstract....................................................... II Introduction.................................................... 1 1 System overview............................................... 2 The analysis of responder needs........................ 2 Responder work process ............................... 2 2 MCU features ................................................ 3 STC89C51................................................ 3 Special function register............................. 3 The internal structure of STC89c51..................... 5 3 The design of circuit system.................................. 6 The circuit system ................................... 6 The design of minimum system........................... 7 The design of power supply............................ 7 The design of clock circuit.......................... 7 The design of reset circuit ......................... 9 The design of display circuit.......................... 11 Digital tube profile................................ 12 The introduction of CD4511........................... 13 The design of key circuit ............................ 15 The design of buzzer ................................. 15 Components and welding debugging ....................... 17 4 The design of software ..................................... 19 Delay subroutine....................................... 19 Display program........................................ 19 The countdown and keyboard scanning subroutine...... 19 Main program and analysis............................. 20 5 Conclusions.................................................. 23 References..................................................... 24 Acknowledgement................................................ 25 Appendix 1..................................................... 26 Appendix 2..................................................... 27 I 基于 51 單片機的四路搶答器設計 作者：吳新春，指導教師：劉平 （山東農業(yè)大學 講師） 【摘要】 本文設計以 STC89C51單片機為核心的四路搶答器。 采用了數(shù)字顯示器直接顯示，自動鎖存顯示結果，并自動復位的設計思想 ,它能根據(jù)不同的搶答輸入信號，經(jīng)過單片機的控制處理產生不同的與輸入信號相對應的輸出信號，最后通過 LED 數(shù)碼管顯示相應的路數(shù)，分辨出是哪組優(yōu)先按下的按鍵，它充分利用了單片機系統(tǒng)的優(yōu)點，具有結構簡單、功能強大、可靠性好、實用性強的特點。 本設計是以 四 路搶答為基本理念?？紤]到需限