M36W432BG データシートの表示（PDF） - STMicroelectronics

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M36W432BG

32 Mbit (2Mb x16, Boot Block) Flash Memory and 4 Mbit (256Kb x16) SRAM, Multiple Memory Product

STMicroelectronics 

Figure 31. Locking Operations Flowchart and Pseudo Code

M36W432TG, M36W432BG

Start

Write 60h

Write

01h, D0h or 2Fh

Write 90h

Read Block

Lock States

Locking

NO

change

confirmed?

YES

Write FFh

End

locking_operation_command (address, lock_operation) {

writeToFlash (any_address, 0x60) ; /*configuration setup*/

if (lock_operation==LOCK) /*to protect the block*/

writeToFlash (address, 0x01) ;

else if (lock_operation==UNLOCK) /*to unprotect the block*/

writeToFlash (address, 0xD0) ;

else if (lock_operation==LOCK-DOWN) /*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*/

}

AI04364

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