目录摘要.................................................................................................IIIAbstract...............................................................................................IV前言...................................................................................................1第一章绪论..........................................................................................21.1设计的背景和意义........................................................................21.2设计的现状和发展........................................................................21.3设计的目的与意义........................................................................2第二章总体设计.................................................................................42.1总体方案的设计与实现................................................................42.1.1主要设计的内容...................................................................................42.1.2系统的总体设计...................................................................................42.2系统方案论证................................................................................52.2.1单片机的选择.......................................................................................62.2.2读卡芯片的选择...................................................................................62.2.3IC卡的选择..........................................................................................7第三章系统硬件电路的设计.............................................................83.1单片机最小系统模块....................................................................83.1.1主控芯片...............................................................................................83.1.2复位电路...............................................................................................93.1.3晶振电路.............................................................................................103.2MFRC522读写模块....................................................................103.2.1MFRC522芯片介绍...........................................................................103.2.2S50卡功能介绍..................................................................................133.2.3MFRC522模块工作原理...................................................................133.2.4读写模块电路.....................................................................................133.3显示电路模块..............................................................................143.3.1LCD1602介绍....................................................................................143.3.2显示模块电路.....................................................................................153.4矩阵键盘电路..............................................................................153.5报警电路......................................................................................163.6电源模块......................................................................................173.7与PC机的通信电路...................................................................173.7.1USB接口............................................................................................183.7.2CH340USB转串口芯片..........................................
