M28W640FCT datasheet(65/77 Pages) STMICROELECTRONICS

65 / 77 page

M28W640FCT, M28W640FCB

Flowcharts and pseudo codes

65/77

Figure 17.

Double 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 and Address 2 must be consecutive addresses differing only for bit A0.

Write 30h

AI03539b

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)

double_word_program_command (addressToProgram1, dataToProgram1,

addressToProgram2, dataToProgram2)

{

writeToFlash (any_address, 0x30) ;

writeToFlash (addressToProgram1, dataToProgram1) ;

/*see note (3) */

writeToFlash (addressToProgram2, dataToProgram2) ;

/*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 ( ) ;

}

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