-PAGEI-摘要本文介绍了一种以AT89S51单片机设计的医院病房无线呼叫系统。该系统由单片机系统、无线收发系统、功能开关、1602液晶显示器、以ISD4004语音芯片为主的语音系统等单元电路组成。该系统所用到的无线收发系统采用315无线收发模块的PT2262和PT2267编解码芯片，利用单片机的串行半双工通信来实现。它的核心控制器采用价格低廉，性能可靠的单片机。该系统主要工作原理是分机按键呼叫，主机声光报警，同时显示呼叫的号码，主机按键可回复。研究表明该系统使用方便、快捷、安全可靠，可应用于医院、茶庄、KTV、餐厅等领域。在市场经济体制中，尤其在服务性的行业中，更省人、省钱、省心，更能提高企业效率，提高服务形象，带来更好的经济效益，可作为电子产品进行开发研制，具有很好的推广价值。关键词：单片机技术无线发射和接收无线呼叫系统-PAGEII-AbstractThispaperintroducesaSCM(single-chipmicrocomputer)ATMELAT89S52MCUasawirelesscallingsysteminhospitalwards.ThissystemconsistsofSCMsystem,wirelesstransceiversystem,thefunctionalswitch,1602LCD,andbythemainofvoicISD4004asavoicesystemsunitcircuitetc.Whattheuseofthesystemisthewirelesstransceiversystemwhichinvlvesawirelesstransceivermodule315ofthePT2262andPT2267codecchip,andbringsabouttheSCM’shalf-duplexcommunication.ThecorecontrolleroptionaledSCMwithlowpriceandreliableperformance.Thecallextpressthenthehostsound-lightalarm,displaythecallnumbersatthesametimeandatlastthehostgiveareplybypressthebuttonisthemainworkingprincipleofthesystem.Thestudyshowsthatthissystemhasthecharacteristicsofeasytosue,fast,safeandreliable.Anditcanbeusedsomesocialfieldssuchashospital,teahouse,KTV,restaurant,etc.Inthemarketeconomicsystem,especiallyintheserviceindustry,Usingitthatcanbemoresavingstaffs,moneyaswellastrouble.Whatmoreitcanimprovesthecompany’sefficiency,enhancestheimageofservices,andbringseconomicbenefits.Soitcanbeusedaselectronicproducttoresearchanddevelopment,Inmyopinion,ithasagoodvalueofpromotion.Keyword:SCM(single-chipmicrocomputer)TransmitandreceivewirelessTheWirelessCallingSystem目录摘要................................................................................................ⅠAbstract..........................................................................................Ⅱ一、绪论..........................................................................................1(一)设计任务....................................................................................1（二）设