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M34C00 датащи(PDF) 8 Page - STMicroelectronics |
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M34C00 датащи(HTML) 8 Page - STMicroelectronics |
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8 / 15 page ![]() M34C00 8/15 Figure 10. Reading the Protection Register SDA AI03719B NoACK Data Out FFh ACK Device Select Code RW SDA NoACK Data Out FFh NoACK Device Select Code RW If the Protection Register has been set: If the Protection Register has not yet been set: 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. Figure 9. Setting the Protection Register SDA AI03718 ACK Byte Address Don't Care ACK Data In Don't Care ACK Device Select Code RW SDA NoACK Byte Address Don't Care NoACK Data In Don't Care NoACK Device Select Code RW If the Protection Register has already been set: If the Protection Register has not yet been set: |
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