Hi,
Hope you are doing well. The CLRC663 is a frontend that works command based, so you can send the SPI commands with your host MCU. We recommend to use the NFC Reader Library.
We have some guides you help you in the migration process, the first thing I would recommend you to check would be the NFC Reader Library webinar to understand the structure of the library.
Once you have understand it, you can check the following guides for the migration process.
Porting NFC Reader Library to Kinetis K64 | Document | Video
Porting NFC Reader Library to LPC11u37h | Document I, II, III, IV
Porting NFC Reader Library to i.MX RT1050 | Document | Video
Also you can check the AN11908, please consider the memory requirements to deploy the library in your device as well as the protocol necessities regarding the clocks of the device and do not forget to read the license agreement of the library.
Best Regards,
Ricardo