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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SRTAG512L датащи(PDF) 14 Page - STMicroelectronics |
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SRTAG512L датащи(HTML) 14 Page - STMicroelectronics |
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14 / 51 page  SRTAG512L memory management SRTAG512L 14/51 DocID027439 Rev 2 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 SRTAG512L device before reading a read-locked NDEF file. The write password shall be present on the SRTAG512L 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. 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. Table 8. 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 9. 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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