M58LR128FT datasheet(17/82 Pages) STMICROELECTRONICS

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M58LR128FT, M58LR128FB

A0 = CR0, A1 = CR1, …, A15 = CR15. Addresses

A16- A22 are ignored.

Once the Set Configuration Register command

has been issued, read operations will output the

array contents.

The Read Electronic Signature command is re-

quired to read the updated contents of the Config-

uration Register.

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 after

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 and locks the block.

The lock status can be monitored for each block

using the Read Electronic Signature command.

Table 14. shows the Lock Status after issuing a

Block Lock command.

Once set, the Block Lock bits remain set until a

hardware reset or power-down/power-up. They

are cleared by a Block Unlock command.

Refer to the section, Block Locking, for a detailed

explanation.

See

APPENDIX

C.,

Figure

27., Locking Operations Flowchart and Pseudo

Code, for a flowchart for using the Lock command.

Block Unlock Command

The Block Unlock command is used to unlock a

block, allowing the block to be programmed or

erased.

Two Bus Write cycles are required to issue the

Block Unlock command.

■

The first bus cycle sets up the Block Unlock

command.

■

The second Bus Write cycle latches the block

address and unlocks the block.

The lock status can be monitored for each block

using the Read Electronic Signature command.

Table 14. shows the protection status after issuing

a Block Unlock command.

Refer to the section, Block Locking, for a detailed

explanation

and

APPENDIX

C.,

Figure

27., Locking Operations Flowchart and Pseudo

Code, for a flowchart for using the Block Unlock

command.

Block Lock-Down Command

The Block Lock-Down command is used to lock-

down a locked or unlocked block.

A locked-down block cannot be programmed or

erased. The lock status of a locked-down block

cannot be changed when WP is low, VIL. When

WP is high, VIH, the lock-down function is disabled

and the locked blocks can be individually unlocked

by the Block Unlock command.

Two Bus Write cycles are required to issue the

Block Lock-Down command.

■

The first bus cycle sets up the Block Lock-

Down command.

■

The second Bus Write cycle latches the block

address and locks-down the block.

The lock status can be monitored for each block

using the Read Electronic Signature command.

Locked-Down blocks revert to the locked (and not

locked-down) state when the device is reset on

power-down. Table 14. shows the Lock Status af-

ter issuing a Block Lock-Down command.

Refer to the section, Block Locking, for a detailed

explanation

and

APPENDIX

C.,

Figure

27., Locking Operations Flowchart and Pseudo

Code, for a flowchart for using the Lock-Down

command.

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