ST25TB02K datasheet(11/47 Pages) STMICROELECTRONICS

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4.1

EEPROM area

4.1.1

Block 0-4: resettable OTP area

This area contains five individual 32-bit Boolean words (see Table 4 for a map of the area). A Write_block

command doesn't erase the previous contents of the block as the write cycle is not preceded by an auto-erase

cycle. This feature can be used to reset selected bits from 1 to 0. All bits previously at 0 remain unchanged. When

the 32 bits of a block are all at 0, the block is empty, and cannot be updated any more. See Figure 1 and Figure 2

for examples of the result of the Write_block command in the resettable OTP area.

Table 4. Resettable OTP area (addresses 0 to 4)

Block Address

MSB

32-bit block

LSB

Description

b31

b24 b23

b16 b15

b8 b7

32-bit Boolean area

Resettable

OTP bit

32-bit Boolean area

Figure 12. Write_block update in Standard mode (binary format)

...

Previous data stored in block

Data to be written

New data stored in block

b31

The five 32-bit blocks making up the resettable OTP area can be erased in one go by adding an auto-erase

cycle to the Write_block command. An auto-erase cycle is added each time one reload mode is activated. The

reload mode is implemented through a specific update of the 32-bit binary counter located at block address 6 (see

Section 4.2 32-bit binary counters for details).

Figure 13. Write_block update in Reload mode (binary format)

ai07659

...

Previous data stored in block

Data to be written

New data stored in block

b31

ST25TB02K

EEPROM area

DS11469 - Rev 7

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