ST25TA64K datasheet(14/45 Pages) STMICROELECTRONICS

tên linh kiện	ST25TA64K

Giải thích chi tiết về linh kiện	NFC Forum Type 4 Tag IC with 64-Kbit EEPROM

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ST25TA64K memory management

ST25TA64K

14/45

DocID027764 Rev 1

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

3.2.2

Changing the read access right to NDEF files

The state diagram on Figure 2 shows how to change the access right to read an NDEF file.

Figure 2. Changing the read access right to an NDEF file

1. See the procedure to lock the read access (Section 7.4: Locking an NDEF file).

2. See the procedure to unlock the read access (Section 7.5: Unlocking an NDEF file).

3. See the procedure to permanently lock the read access (Section 7.6: Reaching the read-only state for an

NDEF file).

4. Proprietary state, not defined by NFC Forum Type 4 Tag.

Table 6. Read access right

Value

Meaning

0x00

Read access without any security

0x80

Locked (1)

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

0xFE

Read not authorized

Table 7. Write access right

Value

Meaning

0x00

Write access without any security

0x80

Locked (1)

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

0xFF

Write not authorized

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