M58PR256LE datasheet(102/119 Pages) STMICROELECTRONICS

102 / 119 page

Flowcharts and pseudocodes

M58PR256LE, M58PR512LE, M58PR001LE

102/119

Appendix C

Flowcharts and pseudocodes

Figure 20.

Program and EFA block program flowchart and pseudocode

Any address within the 'A' segment halves (A3=0) in a 1 Kbyte program region configured in control program mode.

If a Program command is issued to a program region configured in the Object Program mode, SR4 and SR8 are set.

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.

Write 41h (Main Array)

or 44h (EFA) (1)

AI10515

Start

Write Address

& Data

Read Status

YES

SR7 = 1

YES

SR3 = 0

SR4 = 0

VPP Invalid

Error (2, 3)

Program

Error (2, 3)

program_command (addressToProgram, dataToProgram)

/* EFA_program_command (addressToProgram, dataToProgram) */

{

writeToFlash (addressToProgram, 0x41);

/*writeToFlash (addressToProgram, 0x44);*/

/* 41h is the command for program array, while 44h

is the command for program EFA block */

/*see note (1)*/

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 (2, 3)

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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