M36W432B85ZA1T データシートの表示（PDF） - STMicroelectronics

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M36W432B85ZA1T

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

STMicroelectronics 

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*/

}

AI05227

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