This application note describes the ISO/IEC 14443-3 libraries used by a microcontroller to drive the CR95HF 13.56 MHz multiprotocol contactless transceiver using an SPI or UART interface in order to perform wireless communications with ISO/IEC 14443 Type A or B contactless tag. The library was developed to speed up the development of applications using the CR95HF. The CR95HF library is composed of three layers: ■ CR95HF low level layer ■ Standard ISO/IEC 14443-3 protocol layer (type A and type B) ■ SRIX4K product specific layer The library code has been developed in ANSI C language, and validated on an STM32 evaluation board.