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1、桂林电子科技大学课程设计(论文)报告用纸第11页共12页引言《课程设计》是为了让我们更好的理解所学知识,体会理论与实践之间的联系,将所学理论真正用到实处。作为一名合格的大学生不仅需要有扎实的理论知识,还需要过硬的动手能力;《课程设计》这门课程就给了我们这样一个机会。此次课程设计,让我们用所学的数字电子技术的基础知识,设计一个秒计时器,不仅能够加深我们对电子系统设计过程的理解,而且有助于我们对书本知识的进一步深化。本作品的实现全部采用各种门电路及计数器芯片,利用自锁开关对电路进行控制,并且计时器具有十秒报警功能。1设计任务及要求1.1设计任务设计并制作一个秒计时器1.2设计要求1)有秒计时显
2、示功能;2)设定外部操作开关,控制计时器的清零、启动和暂停/连续功能;3)计时器为秒递减或递加计时器,其计时间隔为1s;4)计时器计时值为10秒的整数倍时,有提示。2系统各部分设计方案介绍2.1设计总体方框图系统电源主计数器74ls19210s整数倍报警器显示数码管清零/启动控制开关秒脉冲发生器暂停/连续控制开关图2.1.1系统框图2.2系统各部分设计方案介绍andoutoftheprojectwithinthecontrolzonechannelandstatusinformationforeachroomintheidentification,recording,storing,que
3、rying,throughthefrontcontroller,cardreader...Accesscontrolsystemsandfirealarmsystemscanbeeitheranetworkcommunicationorserialinterfacecommunication,youcanalsousehardinterfaceoflinkagewiththefireprotectionsystem.Whenafireoccurs,accesscontrolsystemtomanagethehostpartitionoftheareadisplayedonthescreen
4、andalarmlocation,definingevacuationroutesaccordingtothepresetprograminstructions,accordingtothelocationofthefireandemergencyevacuationdoorsopenorisolatethefiredoorclosed.Whenmorethanonesignalalarm,canbedisplayedaccordingtoapresetpriorityleveltodeterminetheorderorarrangementofthescreen.Accesscontro
5、lsystemwithmapeditingfeatures,administratorscanmonitortheplanecenteredonthemapdesign,canbedividedaccordingtotheirownrequirementszonewhenwhenalarmeventsoccurwithinazone,thezoneonthemapsystemsecuritywilltriggerlinkage,andvisuallydisplayedonthemap,andallowmanagerstoquicklydevelopatreatmentapproach.Ce
6、ntreforconsumercard(thissystemisincludedintheaccesscontrolsystem)Centerexpendsacartoonsystemusesb/sandc/sarchitecturecanbeusedwithanymanagementplatformsysteminterconnection.Mainlytomeetinternalandexternalcanteendiningratecard,canteenandissuingdatacenterreal-timeinformationsharingthroughdatabases.P
7、OSmachinethroughTCP/IPcommunicationswaysecurity,andefficientActiveuploadinformationtomanagementserver,systemcanaccordingtoitselfconsumptionmanagementneedonequipment,andconsumptiontype,andpaymentterminalbelonging,