LRIS2K_11 datasheet(78/98 Pages) STMICROELECTRONICS

78 / 98 page

Lock Password

LRIS2K

78/98

Doc ID 13888 Rev 9

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 72)

Response parameter:

●

No parameter.

Table 71.

Lock Password request format

Request

SOF

Request

_flags

Lock

Password

MFG

code

UID

Block

number

Protect

Status

CRC16

Request

EOF

8 bits

B2h

02h

64 bits

8 bits

16 bits

Table 72.

Protect status

password control bits

Read / Write protection

bits(1)

b1b2 is 00 or 11. Other combinations are reserved but will behave as 11 in terms of protection settings.

Table 73.

Lock Password response format when Error_flag is NOT set

Response

SOF

Response_flags

CRC16

Response

EOF

8 bits

16 bits

Table 74.

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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