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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST25TA02K-P датащи(PDF) 23 Page - STMicroelectronics |
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ST25TA02K-P датащи(HTML) 23 Page - STMicroelectronics |
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23 / 64 page  DocID027794 Rev 2 23/64 ST25TA02K-P ST25TA02K-P memory management Warning: When GPO config lock bit is set to "1", the whole byte cannot be changed anymore. 3.2 Read and write access rights to the NDEF File The NDEF file can be locked for read or write accesses. It is also protected by a 128-bit password that the host shall present before accessing the NDEF file. There are two 128-bit passwords, one for the read access and the other one for the write access. An NDEF file can be permanently locked for read or write accesses. Thus, the host cannot access the NDEF file. The read password shall be sent to the ST25TA02K-P device before reading a read-locked NDEF file. The write password shall be present on the ST25TA02K-P device before writing a write- locked NDEF file. The write password shall be sent to change the read or write access. The read or write access right is defined for the NDEF file. 3.2.1 State of the Read and Write access rights Two bytes in the CC file are used to define the Read and Write access rights to the NDEF file. For more details, refer to Section 3.1.2: CC file layout. Table 8. Details about the Counter config field File offset b7 b6-b2 b1 b0 0x0003 Counter config lock bit: 0b0: unlocked 0b1: locked 0b00000: ST reserved Counter enable: 0b0: disable 0b1: enable Counter increment: 0b0: on Read 0b1: on Write Table 9. 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 |
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