AN3163

Accessing the M24LRxx memory

Doc ID 17157 Rev 2

5/13

The M24LRxx is now clearly recognized by the ISO 15693 RF reader via its IC

reference code (2Ch).

The ISO 15693 RF reader can now use the M24LRxx’s custom set of commands and

make the most of the M24LRxx’s broad data management capability.

3.

Access to the user memory:

The ISO 15693 RF reader is now able to use the extended command set provided with

the M24LRxx to access and manage its memory contents:

Table 4.

Get System Info response format when Error_flag is NOT set

Response

SOF

Response

_flags

Information

flags

UID

DSFID AFI

Memory

Size

IC

reference

CRC16

Response

EOF

00h

0Fh

64 bits

8 bits 8 bits 0307FFh

2Ch

16 bits

Table 5.

Definition of request flags when the Inventory_flag is NOT set

Bit No

Flag

Level

Description

Bit 1

1.

Subcarrier_flag refers to the M24LRxx-to-VCD communication.

0

A single subcarrier frequency is used by the M24LRxx

1

Two subcarrier frequencies are used by the M24LRxx

Bit 2

2.

Data_rate_flag refers to the M24LRxx-to-VCD communication

0

Low data rate is used

1

High data rate is used

Bit 3

Inventory_flag

0

Defines the meaning of flags 5 to 8 as described below.

Bit 4

Protocol_extension_flag

0

No Protocol format extension

1

Protocol format extension

Bit 5

3.

If the Select_flag is set to 1, the Address_flag is set to 0 and the UID field is not present in the request.

0

The request is executed by any M24LRxx according to

the setting of Address_flag

1

The request is executed only by the M24LRxx in

Selected state

Bit 6

Address flag(3)

0

The request is not addressed. UID field is not present.

The request is executed by all M24LRxxs.

1

The request is addressed. UID field is present. The

request is executed only by the M24LRxx whose UID

matches the UID specified in the request.

Bit 7

Option flag

0

Option not activated.

1

Option activated.

Bit 8

RFU

0