SLOA246B January 2018 – March 2019 TRF7964A , TRF7970A
TI does not have any example code for this transponder and does not plan to develop such firmware.
Due to the inter-byte timing requirements for Topaz-512 tags, the TRF79xxA devices cannot leverage the built-in hardware encoders and demodulators as it does for most NFC/RFID transponders. Communication with these tags using the TRF79xxA is possible through the use of Direct Mode 0.
Direct Mode 0 allows the TRF79xxA to pass the raw modulated signals to the host MCU or receive a subcarrier digital data stream from the host MCU. The host MCU must run at a multiple of 13.56 MHz to demodulate received signals or encode subcarrier data. Consult the appropriate TRF79xxA data sheet for further detail about Direct Mode 0.