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M28W640FCT Folha de dados(PDF) 21 Page - STMicroelectronics

Nome de Peças M28W640FCT
Descrição Electrónicos  64 Mbit (4Mbx16, Boot Block) 3V Supply Flash memory
PDF  77 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M28W640FCT Folha de dados(HTML) 21 Page - STMicroelectronics

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4.13
Block Lock command
The Block Lock command is used to lock a block and prevent Program or Erase operations
from changing the data in it. All blocks are locked at power-up or reset.
Two Bus Write cycles are required to issue the Block Lock command.
●
The first bus cycle sets up the Block Lock command.
●
The second Bus Write cycle latches the block address.
The lock status can be monitored for each block using the Read Electronic Signature
command. Table 10 shows the protection status after issuing a Block Lock command.
The Block Lock bits are volatile, once set they remain set until a hardware reset or power-
down/power-up. They are cleared by a Blocks Unlock command. Refer to the section, Block
Locking, for a detailed explanation.



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