LRIS2K_08 datasheet(79/102 Pages) STMICROELECTRONICS

79 / 102 page

LRIS2K

Lock Password

79/102

Lock Password

On receiving the Lock Password command, the LRIS2K sets the access rights and

permanently locks the selected block. The Option_flag is supported.

RFU bit 8 of the request_flag is used to select either the memory area (bit 8 = ‘0’) or the

password area (bit 8 = ‘1’).

During the write cycle tW, there should be no modulation (neither 100% nor 10%) otherwise,

the LRIS2K may not correctly lock the memory block.

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

Request parameters:

●

(Optional) UID

●

Block number (bit 8 = ‘1’: 00h = Kill, 01h = Pswd1, 02h = Pswd2, 03h = Pswd3, other =

Error)

●

Protect status (refer to Table 73)

Response parameter:

●

No parameter.

Response parameter:

●

Error code as Error_flag is set:

–

10h: block address not available

–

11h: block is locked

–

14: block not locked

Table 72.

Lock Password request format

Request

SOF

Request

_flags

Lock

Password

IC Mfg

code

UID

Block

number

Protect

Status

CRC16

Request

EOF

8 bits

B2h

02h

64 bits

8 bits

16 bits

Table 73.

Protect status

password control bits

Read / Write protection

bits

Table 74.

Lock Password response format when Error_flag is NOT set

Response

SOF

Response_flags

CRC16

Response

EOF

8 bits

16 bits

Table 75.

Lock 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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