M24SR View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

M24SR

Dynamic NFC/RFID tag IC with 2-Kbit EEPROM, NFC Forum Type 4 Tag and I²C interface

STMicroelectronics 

M24SR02-Y memory management

M24SR02-Y

3.2.2

Table 12. Read access right

Value

Meaning

0x00

0x80

0xFE

Read access without any security

Locked (1)

Read not authorized

1. The read password shall be sent before reading in the NDEF file.

Value

Table 13. Write access right

Meaning

0x00

0x80

0xFF

Write access without any security

Locked (1)

Write not authorized

1. The write password shall be sent before writing in the NDEF file.

The state 0xFF and 0xFE cannot be changed by using the Read or Write passwords.

Changing the read access right to NDEF files

The state diagram on shows how to change the access right to read an NDEF file.

Figure 10. Changing the read access right to an NDEF file

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1. See the procedure to lock the read access (Section 8.4: Locking an NDEF file).

2. See the procedure to unlock the read access (Section 8.5: Unlocking an NDEF file).

3. See the procedure to permanently lock the read access (Section 8.6: Reaching the read-only state for an

NDEF file).

4. Proprietary state, not defined by NFC Forum Type 4 Tag. For NFC Forum compatible tags, the only

possible value of the read access rights are 0x00 (no restrictions on reads).

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