6.15.3.3.8 NFCID1 Number Register (0x17)
This register is used to hold the ID of the TRF7970A for use during card emulation and NFC peer-to-peer target operations.
The procedure for writing the ID into register 0x17 is the following:
- Write bits 5, 6, and 7 in register 0x18 to enable SDD anticollision (bit 5), and set bit 6 and 7 to select the ID length of 4, 7, or 10 bytes.
- Write the ID into register 0x17. This should be done using write continuous mode with 4, 7, or 10 bytes (according to what was set in register 0x18 bits 6 and 7).