M28W320 데이터 시트보기 (PDF) - STMicroelectronics

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M28W320

32 Mbit (2Mb x16, Boot Block) 3V Supply Flash Memory

STMicroelectronics 

Flowcharts and pseudo codes

Figure 22. Locking Operations Flowchart and Pseudo Code

M28W320FCT, M28W320FCB

Start

Write 60h

Write

01h, D0h or 2Fh

Write 90h

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) ;

Read Block

Lock States

Locking

NO

change

confirmed?

YES

Write FFh

End

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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