ST25TA02K datasheet(13/50 Pages) STMICROELECTRONICS

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ST25TA02K

ST25TA02K memory management

3.1.4

System file layout

The system file specifies the configuration of the ST25TA02K. Table 6 lists the different

fields.

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.

Table 6. Field list

File offset

Field name

Number of

bytes

Read access Write access Delivery state

0x0000

Length system file

yes

0x0012

0x0002

ST reserved

yes

none

0x80

0x0003

Event Counter

Config

yes

yes(1)

1. Configuration bytes can be locked by setting the Most significant bit to 1. Once locked, these bytes cannot

be changed anymore.

0x00

0x0004

20 bits counter (MS

nibble 0x0)

yes

none

0x000000

0x0007

Product version

yes

none

0x13(2)

2. ST reserved.

0x0008

UID

yes

none

0x02E2 xx xx

xx xx xx (3)

x values are defined by ST to ensure UID unicity.

0x000F

Memory Size - 1

yes

none

0x00FF

0x0011

Product Code

yes

none

0xE2

Table 7. 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

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