说明：  89C51与接触式IC卡接口，使用汇编工具编写的IC卡读写程序，电路连接简单，使用I^2C总线，具体电路在压缩文件中
(89C51 with the contactless IC card interface, the use of tools to prepare a compilation of the IC card reading and writing process, a simple circuit to connect, use the I ^ 2C bus, the specific circuit in the compressed file)