摘要
在射频卡的系统应用中,关键要解决对射频芯片输出的数据进行解码问题。在通常的设计中,都是采用单片机不断地检测电平变化的方法进行解码。论文提出了另外一种在MCS-51单片机平台下对EM4100A6芯片输出的64位曼彻斯特编码格式的数据进行解码的方法。这种方法结合单片机的硬件和曼彻斯特码编码的特点,利用计算曼彻斯特码下降沿间隔的载波数的方法进行解码,大大提高了解码的速度和准确性,而且硬件设计简单,是一种非常实用的解码技术。
It is the key problem for Radio Frequency Integrated Circuit Card applying system to decode the output data from RF chip. Generally, continuous edge-status check by microcomputer is adopted in order to decode data. The article mainly introduces another new technology which decodes 64-bit data coded in Manchester from EM4100 A6 IC based on MCS-51 microcomputer. The technology decodes Manchester code by the means of counting carrier between the fallingedge interval of signal in consideration of the features of microcomputer and Manchester code. Speed and precision of decoding Manchester are promoted, hardware design are comparatively simple. To sum up, it is a quite applicable decoding technology.
出处
《信息安全与通信保密》
2007年第12期65-67,共3页
Information Security and Communications Privacy
