SRTAG2KL View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'SRTAG2KL' PDF : 51 Pages View PDF
SRTAG2KL memory management
SRTAG2KL
3.2.1
3.2.2
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 SRTAG2KL device before reading a read-locked
NDEF file.
The write password shall be present on the SRTAG2KL 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.
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.
Value
Table 8. Read access right
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.
Table 9. Write access right
Value
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 Figure 2 shows how to change the access right to read an NDEF file.
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