M34C00 データシートの表示（PDF） - STMicroelectronics

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M34C00

3 x 128 bit Serial I²C Bus EEPROM For ee-Tags

STMicroelectronics 

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

8/15

AI03719B

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