ST25TA02K datasheet(32/50 Pages) STMICROELECTRONICS

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RF command sets

ST25TA02K

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5.7

ISO/IEC 7816-4 commands

The ISO/IEC 7816-4 command set offers some extended features such as the protection of

the NDEF file. This command set is used to manage the right access of the NDEF file.

5.7.1

Verify command

The Verify command has two functions:

Check if a password is required to access to the NDEF file (the LC field = 0x00).

Check that the password embedded in the Verify command allows the access to the

memory (the Lc field = 0x10 and the password is present).

When the Lc field if equal to 0x00, the verify command returns a success code (0x90 00)

provided that the access to the NDEF file does not require a password. When the access to

the NDEF file is protected, the response to the Verify command returns an error code

(0x63 00).

When the Lc field equals 0x10, on receiving the Verify command, the ST25TA02K compares

the requested password with the data contained in the request and reports whether the

operation has been successful in the response.

Before sending this command, an NDEF file shall be selected by issuing the NDEF Select

command. Thus, this command checks the right access condition of the last NDEF file

selected.

After a successful command, an access is granted for the whole NDEF file.

Table 34 defines the Verify command.

Table 34. Verify command format

Name

CLA

INS

P1 & P2

Data

0x00

0x20

2 bytes

1 byte

Lc bytes

Class byte

Instruction code

Password identification

0x0001: Read NDEF password transmit

0x0002: Write NDEF password transmit

Other: RFU(1)

1. Return ERROR code when used.

0x00: the password is not present

0x10: the password is present in the data field

Password

(empty field)

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