M24LR64-RMB6T2 datasheet(101/128 Pages) STMICROELECTRONICS

101 / 128 page

M24LR64-R

Commands codes

Doc ID 15170 Rev 10

101/128

26.16

Present-sector Password

On receiving the Present-sector Password command, the M24LR64-R compares the

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

operation has been successful in the response. The Option_flag is supported.

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

10%) otherwise, the M24LR64-R the Password value may not be correctly compared.

The Wt 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 4.1: M24LR64-R RF block security.

Request parameter:

●

UID (optional)

●

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

●

Data

Response parameter:

●

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

Response parameter:

●

Error code as Error_flag is set:

–

02h: the command is not recognized, for example: a format error occurred

–

03h: the option is not supported

–

0Fh: error with no information given

–

10h: the specified block is not available

Table 80.

Present-sector Password request format

Request

SOF

Request

_flags

Present-

sector

Password

Mfg

code

UID(1)

Gray means that the field is optional.

Password

number

Data

CRC16

Request

EOF

8 bits

B3h

02h

64 bits

8 bits

32 bits

16 bits

Table 81.

Present-sector Password response format when Error_flag is NOT set

Response

SOF

Response_flags

CRC16

Response

EOF

8 bits

16 bits

Table 82.

Present-sector 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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