AN3163

Configuring your M24LRxx and managing user’s access rights

Doc ID 17157 Rev 2

7/13

2

Configuring your M24LRxx and managing user’s

access rights

The M24LRxx can be customized by using optional commands:

Write AFI, Lock AFI, Write DSFID, Lock DSFID.

The M24LRxx provides useful security features that manage the memory access rights per

sector: Write-sector Password, Lock-sector Password, Present-sector Password, Get

Multiple Block Security Status.

●

For the Lock-sector Password command, the Protocol_extension_flag (bit 4) in the

Request_flag must be set to ‘1’ and “Sector number” must be coded on two bytes

(16 bits).

●

For the Get Multiple Block Security Status command, the Protocol_extension_flag

(bit 4) in the Request_flag must be set to ‘1’, “First block number” and “Number of

blocks” must be coded on two bytes (16 bits).

Figure 2 shows an example of data received by an ISO 15693 RF reader from an

M24LRxx tag.

Table 8.

Lock-sector Password request format

Request

SOF

Request

_flags

Lock-

sector

Password

IC

Mfg

code

1.

Gray means that the field is optional.

Sector

number

Sector

security

status

CRC16

Request

EOF

8 bits

B2h

02h

64 bits

16 bits

8 bits

16 bits

Table 9.

Get Multiple Block Security Status request format

Request

SOF

Request

_flags

Get

Multiple

Block

Security

Status

1.

Gray means that the field is optional.

First

block

number

Number

of blocks

CRC16

Request

EOF

8 bits

2Ch

64 bits

16 bits

16 bits

16 bits