ST25R3918 datasheet(41/141 Pages) STMICROELECTRONICS

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DS13490 Rev 2

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ST25R3918

Application information

140

Table 5. PT_Memory address space

Location

Description

Data usage

0-9

NFCID1 (4/7/RFU bytes)

4 bytes: locations 0-3

7 bytes: locations 0-6

NFC-A anticollision

10,11

SENS_RES2:1

SENS_REQ response

SELR_L1

SEL Level 1 response.

SELR_L2

SEL Level 2 response

SELR_L3

RFU

15,16

NFCF_SC

System code (SC) in SENSF_REQ(1)

1. SENSF_RES is transmitted in case received SC=NFCF_SC or SC=0xFFFF.

NFC-F anticollision

17-35

212/424 polling response SENSF_RES format(2)

2. NFC-212/424k SENS_RES format, see Table 6. The last two bytes in SENSF_RES are transmitted based

on the RC bytes in the SENSF_REQ.

36-47

TSN - Random numbers

Slot selection, 24 4-bit random

numbers are stored(3) (4)

3. The 4-bit slot numbers are sequentially used in the NFC212/424 Polling response. When only four TSN

numbers remain unused, an IRQ with I_sl_wl bit is sent.

4. Depending on the number of slots in the Polling request, appropriate number of the MSB bits in the slot

number is used.

Table 6. NFC-212/424k SENS_RES format

Byte 1

Bytes 2-9

Bytes 10-11

Bytes 12-14

Byte 15

Byte 16

Byte 17

Bytes 18-19

01h

NFCID2

PAD0

PAD1

MRTICHECK

MRTIUPDATE

PAD2

[RD]

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