21河南工学院毕业设计论文论文题目：智能抢答器系部电子通信工程系专业应用电子技术班级应电144学生姓名学号140415201指导教师摘要随着科学技术的发展和普及，各种各样的竞赛越来越多，其中抢答器的作用也越来越重要。本文设计出以AT89S51单片机为核心的八路抢答器，采用了数字显示器直接指示，自动锁存显示结果，并自动复位的设计思想,它能根据不同的抢答输入信号，经过单片机的控制处理并产生不同的与输入信号相对应的输出信号，最后通过LED数码管显示相应的路数，即使两组的抢答时间相差几微秒，也可分辨出是哪组优先按下的按键，充分利用了单片机系统结构简单、功能强大、可靠性好、实用性强的特点。本设计是以抢答为出发点。考虑到依需设定限时回答的功能，利用89S51单片机及外围接口实现的抢答系统，利用单片机的定时器/计数器定时和记数的原理，将软、硬件有机地结合起来，使得系统能够正确地进行计时，同时使数码管能够正确地显示时间。用开关做键盘输出，扬声器发生提示。同时系统能够实现：在抢答中，只有开始后抢答才有效，如果在开始抢答前抢答为无效；满时后系统计时自动复位及主控强制复位；按键锁定，在有效状态下，按键无效非法【关键词】抢答器单片机LED数码显示管定时器/计数器扬声器。ABSTRACTWiththedevelopmentandpopularizationofscienceandtechnology,allkindsofcompetitionsaremoreandmore,andtheroleoftheresponderismoreandmoreimportant.ThispaperdesignseightresponderbasedonAT89S51microcontrollerasthecore,adoptsdigitaldisplaydirectinstructions,automaticlatchdisplayresults,anddesignideaofautomaticreset,itcanansweraccordingtodifferentinputsignals,throughtheMCUcontrolprocessingandproduceoutputdifferentsignalcorrespondingtotheinputsignal,finallydisplaythecorrespondingthewaythroughtheLEDdigitaltube,evenifthetwogroupsQiangdathedifferenceintimeafewmicroseconds,cantellwhichgroupispreferredbypressingthebutton,makefulluseofthecharacteristicsofthesinglechipsystemhastheadvantagesofsimplestructure,powerfulfunction,goodreliabilityandpracticability.Thisdesignistoanswerasthestartingpoint.Consideringaccordingtoneedtosetthefunctionofthelimitanswer,answersystembasedontheMCU89S51andperipheralinterface,theuseofsingle-chiptimer/countertimingandcountingprinciple,thesoftwareandhardwareorganicallyandmakesthesystemcancorrectlytime,whilethedigitaldisplaytothecorrecttime.Switchwiththekeyboardoutput,speakerprompts.Atthesametime,thesystemcanberealized:intheanswer,onlyaftertheanswerisvalid,ifatthebeginningofpreansweranswerinvalid;fullautomaticresetafterthesystemtimingandcontrolforcedreset;keylockintheeffectivestate,thekeyisinvalidillegalKeyWordsRespondermicrocontrollerLEDdigitaldisplaytubetimer/timerspeaker