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 PN512是NXP推出的一款低功耗、支援多協議的13.56MHz射頻介面晶片。在主動模式下，可以讀寫ISO/IEC 14443A/MIFARE、ISO/IEC 14443B和FeliCa卡。到底讀寫哪一種卡，主要決定於對PN512的暫存器設定。在本人開發的一款可讀寫上述三種卡片的讀寫器中，將PN512的暫存器設定值做成一個常量陣列，其內容如下：

code unsigned char CardTypeSetReg[ ][5]={
{0x08,0,0x08,0x08,0x08},

{0x0C,1,0x10,0x10,0x10},

{0x11,2,0x38,0x39,0x3B}, 

{0x12,2,0x92,0x00,0x83},

{0x13,2,0x92,0x00,0x83},

{0x14,2,0x83,0x83,0x83},

{0x15,2,0x00,0x40,0x00},

{0x16,2,0x10,0x10,0x10},

{0x17,2,0x84,0x86,0x86},

{0x18,2,0x55,0x84,0x44},

{0x19,2,0x41,0x4D,0x4D},

{0x1A,2,0x00,0x00,0x00},

{0x1D,2,0x11,0x10,0x10},

{0x1E,2,0x00,0x00,0x90},

{0x23,2,0x88,0x88,0x88},

{0x24,2,0x26,0x26,0x26},

{0x26,2,0x79,0x7F,0x79},

{0x27,2,0x88,0x88,0x88},

{0x28,2,0x30,0x20,0x20},

{0x29,2,0x06,0x06,0x06} 

};