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ISO7816 UART



How ISO7816 UART protocol is different from Normal UART protocol?((hardware and software point of view) 

Why ISO7816 UART protocol is required if we have normal UART protocol for smart card communication?

Is there any difference in hardware for ISO7816 UART from Normal UART?

When any MCU supports smart card interface for payments do we need to have ISO7816 UART for communication or normal UART can also work?

Please share any articles which describes communication of smart card connector with host during payments.