According to http://ww1.microchip.com/downloads/en/AppNotes/01370A.pdf, Input/Output line of ISO 7816 is used for serial data communication between the smart card and the interfacing device. This is a half-duplex communication (The TX and RX lines of Universal Asynchronous Receiver and Transmitter (UART) in the Interfacing Device (IFD) is to be shorted and connected to the I/O line of the smart card). You can just short the TX/RX on CC2530 and connect to ISO 7816. I think the UART driver on CC2530 can use to read data from it no problem.
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