int IsBlock0PCF7931(uint8_t *Block);
int IsBlock1PCF7931(uint8_t *Block);
void ReadPCF7931();
+void EM4xReadWord(uint8_t Address, uint32_t Pwd, uint8_t PwdMode);
+void EM4xWriteWord(uint32_t Data, uint8_t Address, uint32_t Pwd, uint8_t PwdMode);
/// iso14443.h
void SimulateIso14443Tag(void);