LRIS64K datasheet(77/100 Pages) STMICROELECTRONICS

77 / 100 page

LRIS64K

Commands codes

Doc ID 15336 Rev 11

77/100

24.14

Write-sector Password

On receiving the Write-sector Password command, the LRIS64K uses the data contained in

the request to write the password and reports whether the operation was successful in the

response. The Option_flag is supported.

During write cycle time Wt, there must be no modulation at all (neither 100% nor 10%).

Otherwise, the LRIS64K may not correctly program the data into the memory. The Wt time is

equal to t1nom + 18 × 302 µs. After a successful write, the new value of the selected

password is automatically activated. It is not required to present the new password value

until LRIS64K power-down.

Request parameter:

●

UID (optional)

●

Password number (01h = Pswd1, 02h = Pswd2, 03h = Pswd3, other = Error)

●

Data

Response parameter:

●

32-bit password value. The response is sent 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

–

12h: the specified block is locked and its contents cannot be changed.

–

13h: the specified block was not successfully programmed

Table 67.

Write-sector Password request format

Request

SOF

Request

_flags

Write-

sector

Password

IC Mfg

code

UID(1)

Gray means that the field is optional.

Password

number

Data

CRC16

Request

EOF

8 bits

B1h

02h

64 bits

8 bits

32 bits

16 bits

Table 68.

Write-sector Password response format when Error_flag is NOT set

Response

SOF

Response_flags

CRC16

Response

EOF

8 bits

16 bits

Table 69.

Write-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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