M1卡读卡器的电路PCB板图。可根据自己需要进行电路板图的修改变动 。协议为14443B协议，单片机采用宏晶89C54-M1 card reader PCB circuit board diagram. According to their need for change in board changes diagram. Agreement 14443B agreement with Wang Jing 89C54 microcontroller

avr单片机软件模拟viic协议，这是用这款芯片的宏定义-avr single-chip software simulation viic agreement, which is the definition of this macro-chip

基于51单片机的modbus协议，宏晶半导体芯片-Modbus protocol based on 51 single chip microcomputer

此程序用于显示停车场的车位余位，程序最后还附录了一些串口协议，用户可能利用串口调试工具，采用PC发送数据给驱动板，来检测程序代码。另外读者可以根椐代码前面部分的宏定义得知单片机的IO口。，(8051 control led Matrix sourse)