LRIS2K_08 datasheet(81/102 Pages) STMICROELECTRONICS

81 / 102 page

LRIS2K

Present Password

81/102

Present Password

On receiving the Present Password command, the LRIS2K compares the requested

password with the data contained in the request and reports whether the operation has

been successful in the request. The Option_flag is supported.

During the comparison cycle equal to tW, there should be no modulation (neither 100% nor

10%) otherwise, the LRIS2K the Password value may not be correctly compared.

The tW time is equal to t1nom + 18 × 302 µs.

After a successful command, the access to all the memory blocks linked to the password is

changed as described in Section 2: LRIS2K block security.

Request parameters:

●

UID (optional)

●

Password number (0x01 = Pswd1, 0x02 = Pswd2, 0x03 = Pswd3, other = Error)

●

Data

Response parameter:

●

No parameter. The response is send back after the writing cycle

Response parameter:

●

Error code as Error_flag is set:

–

0Fh: other error

Table 76.

Present Password request format

Request

SOF

Request

_flags

Present

Password

Mfg

code

UID

Password

number

Data

CRC16

Request

EOF

8 bits

B3h

02h

64 bits

8 bits

32 bits

16 bits

Table 77.

Present Password response format when Error_flag is NOT set

Response

SOF

Response_flags

CRC16

Response

EOF

8 bits

16 bits

Table 78.

Present Password response format when Error_flag is set

Response

SOF

Response_

Flags

Error code

CRC16

Response

EOF

8 bits

16 bits

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