ST25R3911B datasheet(41/116 Pages) STMICROELECTRONICS

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Figure 23. Flowchart for ISO14443A anticollision with ST25R3911B

Cascade level n (n =1)

1) Fill FIFO with SELn + NVB (0x20)

2) Set registers:

Number of transmitted bytes register 1 = 0x00

Number of transmitted bytes register 2 = 0x10

1) Send command Transmit without CRC

2) Expected interrupts:

I_txe

I_col (if collision occurs)

I_rxs

I_rxe

SELn=0x93 for n=1 for 4 bytes UID

SELn=0x95 for n=2 for 7 bytes UID

SELn=0x97 for n=3 for 10 bytes UID

Read FIFO for the valid data

from the selected PICC

I_col occured?

Set

- no_CRC_rx = 1

- antcl = 1

1) Read Collision Display Register to identify the

bit position where the collision occurred

2) Read FIFO for the response from PICC

1) Fill FIFO with part 1 of bit anticollision frame:

SELn + NVB (available from valid tag response) + received

valid data +1 or 0 for the bit where the collision occurred

2) Set registers: mention the number of received

full bytes and split bits + 1 in:

Number of transmitted bytes register 1

Number of full bytes

Number of transmitted bytes register 2

Set

- no_CRC_rx = 0

- antcl = 0

1) Send command Transmit with CRC

2) Expected nterrupts:

I_txe

I_rxe

Send SELECT: fill FIFO with

SELn + NVB(0x70) + UID CLn

UID complete?

End anticollision

with RATS

Enter

Cascade level n+1

Yes

FIFO is filled in with PICC response

FIFO is filled in with SAK

PICC sends complete UID

1.2.18

FeliCa™ reader mode

The general recommendation from Section 1.2.17 Reader operation is valid for FeliCa™ reader mode as well.

Both 212 and 424 kb/s bit rates are supported, they are same in both directions (reader to tag and tag to reader).

Modulation reader to tag is AM.

In FeliCa™ mode the FeliCa™ frame format (see Table 14) is supported.

Table 14. FeliCa™ frame format

Preamble

Sync

Length

Payload

CRC

48 data bits,

all logical 0

2 bytes

(B2h, 4Dh)

Length byte (value= payload length + 1),

the length range is from 2 to 255

Payload

2 bytes

ST25R3911B

Application information

DS11793 - Rev 6

page 41/116

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