LRIS2K datasheet(77/102 Pages) STMICROELECTRONICS

77 / 102 page

LRIS2K

Write Password

77/102

Write Password

On receiving the Write Password command, the LRIS2K uses the data contained in the

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

request. The Option_flag is supported.

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

Otherwise, the LRIS2K may not correctly program the data into the memory. The tW time is

equal to t1nom + 18 × 302 µs. After a successful write, the selected password must be locked

again by issuing a Lock Password command to re-activate the block protection.

Prior to writing the password for a block, the Write Password command erases the Protect

Status area of the block.

Request parameters:

●

UID (optional)

●

Password number (00h = Kill, 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:

–

10h: block address not available

–

12h: block is locked

–

13h: block not programmed

Table 69.

Write Password request format

Request

SOF

Request

_flags

Write

Password

IC Mfg

code

UID

Password

number

Data

CRC16

Request

EOF

8 bits

B1h

02h

64 bits

8 bits

32 bits

16 bits

Table 70.

Write Password response format when Error_flag is NOT set

Response

SOF

Response_flags

CRC16

Response

EOF

8 bits

16 bits

Table 71.

Write 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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