SL2S3003FUD datasheet(67/82 Pages) NXP

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NXP Semiconductors

SL2S3003/SL2S3003TT

ICODE 3 (TagTamper)

8.5.3.25 24-bit counter

Block 75 of the user memory contains the 24-bit counter. The block can be accessed with the standard READ

and WRITE commands but special data considerations are required.

The standard password protection mechanisms for the user memory are not valid for block 75.

The 24-bit counter (block 75) can be:

• Read.

• Increased by one with the option of read password protection.

• Preset to the initial start value with the write password protection.

The counter can be read with any read command including block 75. The 4-byte data from block 75 provide the

following information:

Byte

Name

Value

Description

0x00 - 0xFF

LSB of the counter value

0x00 - 0xFF

—

0x00 - 0xFF

MSB of the counter value

0x00

Incrementing of the counter value is not password protected

PROT

0x01

Incrementing of the counter value is protect with the read password

Table 132. COUNTER BLOCK data structure

The counter can be preset to a start value with a WRITE SINGLE BLOCK command to block 75. As the counter

preset is password protected with the write password, a SET PASSWORD command with the write password is

required before executing the Preset (refer to Section 8.5.3.2 "SET PASSWORD").

The PROT byte (data byte 3) value defines whether the password protection to increment the counter is

enabled or disabled. If the password protection is enabled, the read password is required to increment the

counter value.

The data for the WRITE SINGLE BLOCK command to preset the counter are defined in Table 133.

Note: The Preset counter value of 0x0001 is not possible. A WRITE SINGLE BLOCK command with 0x0001

value only increments the counter.

Byte

Name

Value

Description

0x00, 0x02 - 0xFF

LSB of the counter value

0x00 - 0xFF

—

0x00 - 0xFF

MSB of the counter value

0x00

Disable the password protection to increment the counter

PROT

0x01

Enable the password protection to increment the counter with read

password

Table 133. Preset counter data structure

SL2S3003/SL2S3003TT

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 3.0 — 28 March 2024

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