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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST25TA02K датащи(PDF) 16 Page - STMicroelectronics |
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ST25TA02K датащи(HTML) 16 Page - STMicroelectronics |
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16 / 50 page  ST25TA02K memory management ST25TA02K 16/50 DocID027801 Rev 1 3.2.3 Changing the write access right to NDEF files The state diagram on Figure 3 shows how to change the write access right to an NDEF file. Figure 3. Changing the write access right to an NDEF file 1. See the procedure to lock the write access. 2. See the procedure to unlock the write access. 3. See the procedure to permanently lock the write access (Section 7.6: Reaching the read-only state for an NDEF file). 4. Proprietary state, not defined by NFC Forum Type 4 Tag. 3.3 Access right life time The access right life time is validated while the NDEF file is selected or until the end of the RF session. Once the read or write access right is granted, the host can send one or more ReadBinary or UpdateBinary commands. At the end of a session or when the host selects another file, the read and write access rights are initialized. 3.4 NDEF file passwords The NDEF file passwords protect the read or write access from an RF interface from/to an NDEF file. Two NDEF file passwords are available for each NDEF file: • Read password • Write password The length of a password is 128 bits (16 bytes). Note: The delivery state for all passwords = 0x00000000000000000000000000000000. |
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