4256BWP datasheet(21/39 Pages) STMICROELECTRONICS

부품명	4256BWP

상세설명	256-Kbit serial I짼C bus EEPROM

PDF	39 Pages

Scroll/Zoom	100%

제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

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21 / 39 page

DocID6757 Rev 31

21/39

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.

Initial delivery state

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

(each byte contains FFh).

4256BWP 데이터시트(PDF) 21 Page - STMicroelectronics