m24256-bw STMicroelectronics, m24256-bw Datasheet - Page 21

• Manufacturer Part Number: m24256-bw
• Description: 512 Kbit And 256 Kbit Serial I?c Bus Eeprom With Three Chip Enable Lines
• Manufacturer: STMicroelectronics

M24512-Dx, M24512-x, M24256-Bx
3.19
Read Identification Page status (locked/unlocked)
The locked/unlocked status of the Identification page can be checked by issuing a specific
trunctated instruction consisting of the Identification Page Write instruction (see
Section
Identification page is unlocked, while it will be not be acknowledged if the Identification page
is locked.
Once the acknowledge bit of this data byte is read, it is recommended to generate a Start
condition followed by a Stop condition, so that:
●
●
Figure 11. Read mode sequences
1. The seven most significant bits of the device select code of a Random Read (in the 1
be identical.
Current
Address
Read
Random
Address
Read
Sequential
Current
Read
Sequential
Random
Read
The instruction is truncated and not executed as the Start condition resets the device
internal logic.
The device is set to Standby mode by the Stop condition.
3.10) followed by one data byte. The data byte will be acknowledged if the
Dev sel *
Dev sel *
ACK
Dev sel
Dev sel
Data out N
R/W
R/W
R/W
ACK
ACK
ACK
ACK
R/W
Doc ID 6757 Rev 15
NO ACK
Data out 1
Byte addr
Byte addr
Data out
NO ACK
ACK
ACK
ACK
Byte addr
Byte addr
ACK
ACK
ACK
Data out N
Dev sel *
Dev sel *
NO ACK
R/W
ACK
ACK
R/W
st
and 4
Device operation
Data out 1
Data out
th
bytes) must
AI01105d
NO ACK
ACK
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