M34C00 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'M34C00' PDF : 15 Pages View PDF
M34C00
Figure 9. Setting the Protection Register
If the Protection Register has not yet been set:
Device Select Byte Address
Code RW
SDA
Don't Care
Data In
Don't Care
ACK
ACK
ACK
If the Protection Register has already been set:
Device Select Byte Address
Code RW
SDA
Don't Care
Data In
Don't Care
NoACK
NoACK
NoACK
Reading the Protection Register
To determine whether the Write-protection feature
has been activated, it is possible to read the
Protection Register, as shown in Figure 10.
– If the Protection Register has not been set, the
device acknowledges the read sequence
– If the Protection Register has been set, the
device deselects itself after it has received the
device select code. Consequently, each part of
the sequence is not acknowledged.
AI03718
Figure 10. Reading the Protection Register
If the Protection Register has not yet been set:
Device Select
Code RW
Data Out
SDA
FFh
ACK
NoACK
If the Protection Register has been set:
Device Select
Code RW
Data Out
SDA
FFh
NoACK
NoACK
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AI03719B
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