Good morning,
I am having an strange issue that I can`t solve.
I have an NFC tag NT3H2111, which I could originaly write and modify totally throught the NFC mobile application, but I have modified the user registers via I2C with a microcontroller and now I can't modify those registers with the NFC.
I can write with NFC to the others registers but the group of registers modified with the microcontroler now can just be modified with the microcontroller.
How could I solve it so I can modify them again with the NFC mobile application?
Thanks in adavance.
Hello,
Make sure that you have not modified the fields REG_LOCK for the NFC interface. Please refer to table 13. "Configuration bytes", section: "Configuration register: REG_LOCK" of the product's data-sheet:
https://www.nxp.com/docs/en/data-sheet/NT3H2111_2211.pdf
Please note that once the REG_LOCK_NFC is set to '1', it cannot be reset to '0' anymore.
Regards,
Ivan.