M24256-DFMC6TP(2012) 查看數據表（PDF） - STMicroelectronics

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M24256-DFMC6TP
(Rev.:2012)

256-Kbit serial I²C bus EEPROM

STMicroelectronics 

M24256-BW M24256-BR M24256-BF M24256-DR M24256-DF

Initial delivery state

5.4

Read the lock status (M24256-D only)

The locked/unlocked status of the Identification page can be checked by transmitting a

specific truncated command [Identification Page Write instruction + one data byte] to the

device. The device returns an acknowledge bit if the Identification page is unlocked,

otherwise a NoAck bit if the Identification page is locked.

Right after this, it is recommended to transmit to the device a Start condition followed by a

Stop condition, so that:

● Start: the truncated command is not executed because the Start condition resets the

device internal logic,

● Stop: the device is then set back into Standby mode by the Stop condition.

6

Initial delivery state

The device is delivered with all the memory array bits and Identification page bits set to 1

(each byte contains FFh).

Doc ID 6757 Rev 30

21/40

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