【正文】 ii 山東農(nóng)業(yè)大學(xué) 畢 業(yè) 論 文 基于 51 單片機(jī)的四路搶答器設(shè)計(jì) 院 部：機(jī)械與電子工程學(xué)院 專業(yè) 班級(jí) ： 10 級(jí)自動(dòng)化 1 班 屆 次： 14 屆 學(xué)生姓名： 吳新春 學(xué) 號(hào)： 20202009 指導(dǎo)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(jī)功能簡(jiǎn)介 ................................................................................................ 3 STC89C51 的功能 ................................................................................... 3 STC89C51 特殊功能寄存器 ................................................................ 3 STC89c51 單片機(jī)的內(nèi)部結(jié)構(gòu) ............................................................... 5 3 系統(tǒng)硬件電路的設(shè)計(jì) ........................................................................................ 6 系統(tǒng)總電路如圖 ..................................................................................... 6 最小系統(tǒng)的設(shè)計(jì) ..................................................................................... 7 電源的設(shè)計(jì) .......................................................................................... 7 時(shí)鐘頻率電路的設(shè)計(jì) .......................................................................... 7 復(fù)位電路的設(shè)計(jì) .................................................................................. 9 顯示電路的設(shè)計(jì) ................................................................................... 11 數(shù)碼管簡(jiǎn)介 ........................................................................................ 12 CD4511 七段譯碼器簡(jiǎn)介 .................................................................. 12 按鍵電路的設(shè)計(jì) ................................................................................... 14 蜂鳴器設(shè)計(jì) ........................................................................................... 15 元器件焊接及調(diào)試 ................................................................................ 17 4 系統(tǒng)軟件的設(shè)計(jì) .............................................................................................. 17 延時(shí)子程序 ........................................................................................... 19 顯示子程序 ........................................................................................... 19 倒計(jì)時(shí)加按鍵掃描子程序 ................................................................... 19 主程序及分析 ........................................................................................ 20 5 結(jié)論 .................................................................................................................. 23 參考文獻(xiàn) .............................................................................................................. 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(jī)的四路搶答器設(shè)計(jì) 作者：吳新春，指導(dǎo)教師：劉平 （山東農(nóng)業(yè)大學(xué) 講師） 【摘要】 本文設(shè)計(jì)以 STC89C51單片機(jī)為核心的四路搶答器。 采用了數(shù)字顯示器直接顯示，自動(dòng)鎖存顯示結(jié)果，并自動(dòng)復(fù)位的設(shè)計(jì)思想 ,它能根據(jù)不同的搶答輸入信號(hào)，經(jīng)過單片機(jī)的控制處理產(chǎn)生不同的與輸入信號(hào)相對(duì)應(yīng)的輸出信號(hào)，最后通過 LED 數(shù)碼管顯示相應(yīng)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(jī)系統(tǒng)的優(yōu)點(diǎn)，具有結(jié)構(gòu)簡(jiǎn)單、功能強(qiáng)大、可靠性好、實(shí)用性強(qiáng)的特點(diǎn)。 本設(shè)計(jì)是以 四 路搶答為基本理念?？紤]到需限