简易超市收银机摘要：系统采用AT89C55WD单片机为核心控制器，完成了简易超市收银机的各项功能要求。实现了通过4*4键盘输入商品信息等收银机最基本的功能。本系统的键盘支持数字输入，26个英文字母的输入，功能强大，性能稳定。用灵敏的数字温度传感器DS18B20完成温度测量，精确的日历时钟芯片DS1302作为实时时钟源。同时我们用AT24C512极大扩充了系统存储空间，可以充分满足存储1000个商品价目表和2000个销售日志的要求。收银机的液晶显示采用RT240128GB液晶屏，可滚动显示输入的购物条目信息，并利用FYD12864-0402B液晶显示器来突出显示最后总价，方便顾客看到，使我们的设计作品更加成熟。关键词：AT89C55WD键盘AT24C512液晶Abstract:ThesystemtakestheAT89C55WDasthecorecontrollertocompletethesimplesupermarketcashregistereachfunctionrequest.Itcanrealizethemostbasicfunctionsofcashregister,suchasreadinginmanykindsofsales’informationfrom4*4keyboard.Thissystem’skeyboardsupportsEnglishaswellasdigitalinput.Thefunctionisformidableandtheperformanceisstable.UsetheaccuratedigitaltemperaturesensorDS18B20toreporttosurveythetemperature.UsetheprecisecalendarclockchipDS1302tobethereal-timeclocksource.SimultaneouslyweusedtheAT24C512toexpandthesystem’smemorystoragespacewhichenormouslysatisfyfullythespacerequestof1000commoditypricelistsaswellas2000shoppingdiary.Ourcashregister’sLCDscreenistheRT240128GB.Wemakeitrolltheshoppingclauseinformationthatthedemonstrationscans.ThefinaltotalpriceisalsodisplayedbytheFYD12864-0402B.Theconvenientforcustomertoseetheresultcausesourdesignworktobematurer.Keywords:AT89C55WDkeyboardAT24C512LCD1.方案论证.......................................................................................................................................................................31.1控制器模块选型.......................................................................................................................................................31.2键盘模块方案选择...................................................................................................................................................31.3液晶模块方案选择...................................................................................................................................................31.4存储模块方案选择...................................................................................................................................................31.5温度测量模块方案选择............................................................................................................................................32．详细硬件电路设计.....................................................................................................................................................42.1单片机之间的通信...................................................................................................................................................42.2液晶显示设计.........................................................................................................................................................52.2.1主液晶.................................................................................................................................................................52.2.2从液晶......................................................................................................................................................
