M28W640FCB datasheet(66/77 Pages) STMICROELECTRONICS

66 / 77 page

Flowcharts and pseudo codes

M28W640FCT, M28W640FCB

66/77

Figure 18.

Quadruple Word Program flowchart and pseudo code

Status check of b1 (Protected Block), b3 (VPP Invalid) and b4 (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 operations.

Address 1 to Address 4 must be consecutive addresses differing only for bits A0 and A1.

Write 56h

AI06233

Start

Write Address 1

& Data 1 (3)

Read Status

YES

b7 = 1

YES

b3 = 0

b4 = 0

VPP Invalid

Error (1, 2)

Program

Error (1, 2)

YES

End

YES

b1 = 0

Program to Protected

Block Error (1, 2)

Write Address 2

& Data 2 (3)

quadruple_word_program_command (addressToProgram1, dataToProgram1,

addressToProgram2, dataToProgram2,

addressToProgram3, dataToProgram3,

addressToProgram4, dataToProgram4)

{

writeToFlash (any_address, 0x56) ;

writeToFlash (addressToProgram1, dataToProgram1) ;

/*see note (3) */

writeToFlash (addressToProgram2, dataToProgram2) ;

/*see note (3) */

writeToFlash (addressToProgram3, dataToProgram3) ;

/*see note (3) */

writeToFlash (addressToProgram4, dataToProgram4) ;

/*see note (3) */

/*Memory enters read status state after

the Program command*/

do {

status_register=readFlash (any_address) ;

/* E or G must be toggled*/

} while (status_register.b7== 0) ;

if (status_register.b3==1) /*VPP invalid error */

error_handler ( ) ;

if (status_register.b4==1) /*program error */

error_handler ( ) ;

if (status_register.b1==1) /*program to protect block error */

error_handler ( ) ;

}

Write Address 3

& Data 3 (3)

Write Address 4

& Data 4 (3)

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