The details on transparent mode are fairly lacking in the datasheet. I've found in another thread a few years ago a comment by Ulysses HERNIOSUS which revealed a bunch of extra info (Transparent mode (similar as in ST25R3911B) allows to have all nece...

The description of the ST25R3916 states "Special stream and transparent modes of the AFE and framing system can be used to implement other custom protocols in reader or card emulation mode." - this makes it sound like it should be possible to impleme...