ST25TA02K-P datasheet(23/64 Pages) STMICROELECTRONICS

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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

b6-b2

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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