M58LT256JSB8ZA6 STMICROELECTRONICS [STMicroelectronics], M58LT256JSB8ZA6 Datasheet - Page 28

• Manufacturer Part Number: M58LT256JSB8ZA6
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Command interface
4.14
4.15
4.16
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Set Configuration Register command
The Set Configuration Register command is used to write a new value to the Configuration
Register.
Two Bus Write cycles are required to issue the Set Configuration Register command.
The Configuration Register data must be written as an address during the bus write cycles,
that is A0 = CR0, A1 = CR1, …, A15 = CR15. Addresses A16-A23 are ignored.
Read operations output the array content after the Set Configuration Register command is
issued.
The Read Electronic Signature command is required to read the updated contents of the
Configuration Register.
Block Protect command
The Block Protect command is used to protect a block and prevent program or erase
operations from changing the data in it. All blocks are protected after power-up or reset.
Two Bus Write cycles are required to issue the Block Protect command.
Once the command has been issued subsequent Bus Read operations read the Status
Register.
The protection status can be monitored for each block using the Read Electronic Signature
command.
Refer to
Protect/Unprotect operation flowchart and
Protect command.
Block Unprotect command
The Block Unprotect command is used to unprotect a block, allowing the block to be
programmed or erased.
Two Bus Write cycles are required to issue the Block Unprotect command.
Once the command has been issued subsequent Bus Read operations read the Status
Register.
The protection status can be monitored for each block using the Read Electronic Signature
command.
Refer to
Protect/Unprotect operation flowchart and
Unprotect command.
The first cycle sets up the Set Configuration Register command and the address
corresponding to the Configuration Register content.
The second cycle writes the Configuration Register data and the confirm command.
The first bus cycle sets up the Block Protect command.
The second Bus Write cycle latches the block address and protects the block.
The first bus cycle sets up the Block Unprotect command.
The second Bus Write cycle latches the block address and unprotects the block.
Section 9: Block
Section 9: Block
protection, for a detailed explanation. See
protection, for a detailed explanation and
pseudocode, for a flowchart for using the Block
pseudocode, for a flowchart for using the Block
M58LT256JST, M58LT256JSB
Appendix
Appendix
C,
C,
Figure 25:
Figure 25: