M24LR16E-R datasheet(101/143 Pages) STMICROELECTRONICS

101 / 143 page

M24LR16E-R

Command codes

Doc ID 018932 Rev 8

101/143

26.13

Get Multiple Block Security Status

When receiving the Get Multiple Block Security Status command, the M24LR16E-R sends

back the sector security status. The blocks are numbered from 00h to 01FFh in the request

and the value is minus one (–1) in the field. For example, a value of '06' in the “Number of

blocks” field requests to return the security status of seven blocks.

The Protocol_extension_flag should be set to 1 for the M24LR16E-R to operate correctly. If

the Protocol_extension_flag is at 0, the M24LR16E-R answers with an error code.

During the M24LR16E-R response, if the internal block address counter reaches 01FFh, it

rolls over to 0000h and the Sector Security Status bytes for that location are sent back to the

reader.

Request parameter:

●

Request flags

●

UID (optional)

●

First block number

●

Number of blocks

Response parameters:

●

Sector security status (see Table 75)

Table 73.

Get Multiple Block Security Status request format

Request

SOF

Request

_flags

Get

Multiple

Block

Security

Status

UID(1)

Gray means that the field is optional.

First

block

number

Number

of blocks

CRC16

Request

EOF

8 bits

2Ch

64 bits

16 bits

Table 74.

Get Multiple Block Security Status response format when Error_flag is

NOT set

Response

SOF

Response_

flags

Sector security

status

CRC16

Response

EOF

8 bits

8 bits(1)

Repeated as needed.

16 bits

Table 75.

Sector security status

Reserved for future use. All

at 0.

Password control

bits

Read / Write

protection bits

0: Current sector not locked

1: Current sector locked

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