M58LT128HST datasheet(28/110 Pages) STMICROELECTRONICS

28 / 110 page

Command interface

M58LT128HST, M58LT128HSB

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4.14

Set Configuration Register command

The Set Configuration Register command is used to write a new value to the Configuration

Two Bus Write cycles are required to issue the Set Configuration Register 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 Configuration Register data must be written as an address during the bus write cycles,

that is A0 = CR0, A1 = CR1, …, A15 = CR15. Addresses A16-A22 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.

4.15

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.

●

The first bus cycle sets up the Block Protect command.

●

The second Bus Write cycle latches the block address and protects the block.

Once the command has been issued subsequent Bus Read operations read the Status

The protection status can be monitored for each block using the Read Electronic Signature

command.

Refer to Section 9: Block protection, for a detailed explanation. See Appendix C, Figure 25:

Protect/Unprotect operation flowchart and pseudo code, for a flowchart for using the Block

Protect command.

4.16

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.

●

The first bus cycle sets up the Block Unprotect command.

●

The second Bus Write cycle latches the block address and unprotects the block.

Once the command has been issued subsequent Bus Read operations read the Status

The protection status can be monitored for each block using the Read Electronic Signature

command.

Refer to Section 9: Block protection, for a detailed explanation and Appendix C, Figure 25:

Protect/Unprotect operation flowchart and pseudo code, for a flowchart for using the Block

Unprotect command.

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