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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。
In the RF card system applications, the key to solve the RF chip output data decoding problems. In the usual design, all adopt the method that the one-chip computer detects the level change unceasingly to decode. The paper proposes another method to decode the data of 64 bit Manchester encoding format output by EM4100A6 chip under MCS-51 singlechip platform. This method combined with the hardware of MCU and the characteristics of Manchester code, the use of Manchester Manchester calculation of the number of carriers falling edge of the interval decoding method, greatly improving the decoding speed and accuracy, and the hardware design is simple, it is a very practical Decoding technology.