提供Philips射频C51固件程序完整源代码，经过修改用于产品开发的，有助于清楚地理解ISO14443A(B)协议。-provide Philips C51 RF firmware source code integrity of the process. After modified for product development, contribute to a clear understanding ISO14443A (B) agreement.

nRF2401的C51代码，用于nrf2401的驱动程序。-NRF2401 C51 CODE

一个非接触式IC卡读卡程序，用的是C51系列单片机做的。-A non contactless IC card reader procedures, using a C51 Series MCU do.

一个RFID rc522程序，采用的是模拟SPI接口，运行在C51平台上，程序利用串口打印卡ID号，还有卡类型，该文件可用作二次开发。(A RFID rc522 program, using the analog SPI interface, run on the C51 platform, the program uses the serial port Print Card ID number, as well as the card type, the file can be used f