M36W432T Datasheet, PDF (54/57 Pages) STMicroelectronics – 32 Mbit 2Mb x16, Boot Block Flash Memory and 4 Mbit 256K x16 SRAM, Multiple Memory Product

M36W432T, M36W432B
Figure 30. Locking Operations Flowchart and Pseudo Code
Start
Write 60h
Write
01h, D0h or 2Fh
Write 90h
Read Status
Register
Locking
NO
change
confirmed?
YES
Write FFh
End
locking_operation_command (address, lock_operation) {
writeToFlash (any_address, 0x60) ; /*configuration setup*/
if (lock_operation==PROTECT) /*to protect the block*/
writeToFlash (address, 0x01) ;
else if (lock_operation==UNPROTECT) /*to unprotect the block*/
writeToFlash (address, 0xD0) ;
else if (lock_operation==LOCK) /*to lock the block*/
writeToFlash (address, 0x2F) ;
writeToFlash (any_address, 0x90) ;
if (readFlash (address) ! = locking_state_expected)
error_handler () ;
/*Check the locking state (see Read Block Signature table )*/
writeToFlash (any_address, 0xFF) ; /*Reset to Read Array mode*/
}
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