24C64 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

24C64

64-Kbit serial I²C bus EEPROM

STMicroelectronics 

M24C64-W M24C64-R M24C64-F

5.4

Read the lock status (M24C64-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).

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