9.3.7.4 ISO7816 Mode

The USART features an ISO7816-compatible operating mode. This mode permits interfacing with smart cards and Security Access Modules (SAM) communicating through an ISO7816 link. Both T = 0 and T = 1 protocols defined by the ISO7816 specification are supported.

Setting the USART in ISO7816 mode is performed by writing the FLEX_US_MR.USART_MODE field to the value 0x4 for protocol T = 0 and to the value 0x6 for protocol T = 1.