M58LR128HT datasheet(100/112 Pages) STMICROELECTRONICS

100 / 112 page

Flowcharts and pseudocodes

M58LR128HT, M58LR128HB

100/112

Figure 26.

Protection Register Program flowchart and pseudocode

Status check of SR1 (Protected Block), SR3 (VPP Invalid) and SR4 (Program Error) can be made after each program

operation or after a sequence.

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

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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