M58WR032EB datasheet(71/81 Pages) STMICROELECTRONICS

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M58WR032ET, M58WR032EB

Figure 28. Protection Register Program Flowchart and Pseudo Code

Note: 1. Status check of SR1 (Protected Block), SR3 (VPP Invalid) and SR4 (Program Error) can be made after each program operation or

after a sequence.

2. If an error is found, the Status Register must be cleared before further Program/Erase Controller operations.

3. Any address within the bank can equally be used.

Write C0h (3)

AI06177b

Start

Write Address

& Data

Read Status

YES

SR7 = 1

YES

SR3 = 0

SR4 = 0

VPP Invalid

Error (1, 2)

Program

Error (1, 2)

protection_register_program_command (addressToProgram, dataToProgram) {:

writeToFlash (addressToProgram, 0xC0) ;

/*see note (3) */

do {

status_register=readFlash (addressToProgram) ;

/* see note (3) */

/* E or G must be toggled*/

} while (status_register.SR7== 0) ;

if (status_register.SR3==1) /*VPP invalid error */

error_handler ( ) ;

YES

End

YES

SR1 = 0

Program to Protected

Block Error (1, 2)

writeToFlash (addressToProgram, dataToProgram) ;

/*Memory enters read status state after

the Program Command*/

if (status_register.SR4==1) /*program error */

error_handler ( ) ;

if (status_register.SR1==1) /*program to protect block error */

error_handler ( ) ;

}

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