Decoding Manchester in Radio Frequency Integrated Circuit Card

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 falling- edge 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 decod- ing technology.