4.2.1 Initiator

When the initial RF collision is completed and no RF field has been detected (as shown in Figure 7), the following registers must be modified before and after the anticollision is completed as shown in Figure 9. For more information, see Section 2.

1. ISO Control register (0x01) → 0x88 (ISO14443A 106 kbps, receive without CRC during anticollision, before Select command)
   or
   ISO Control register (0x01) → 0x08 (ISO14443A 106 kbps, receive with CRC after anticollision is completed).
2. Send packet:
   1. Reset FIFO (0x0F) direct command.
   2. Transmission without (0x10, anticollision before Select command) or with (0x11, after anticollision is completed) CRC direct command.
   3. TX Length Byte 1 (0x1D) and TX Length Byte 2 (0x1E) registers.
   4. Write the command to the FIFO.

Unlike the active communication, no further RF collisions are required. The ISO control register needs to be modified for the anticollision state to receive without CRC for the required commands. For more information, see the ISO14443-3 specification. Once the anticollision is completed the ISO Control register needs to be modified to receive with CRC. Step 2 must be used to send commands to the passive target.