M28W800BT datasheet(40/42 Pages) STMICROELECTRONICS

No de pièce	M28W800BT

Description	8 Mbit 512Kb x16, Boot Block 3V Supply Flash Memory

PDF	42 Pages

Scroll/Zoom	100%

Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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40 / 42 page

M28W800BT, M28W800BB

40/42

Figure 20. Erase Suspend & Resume Flowchart and Pseudo Code

Write 70h

AI03549b

Read Status

YES

b7 = 1

YES

b6 = 1

Erase Continues

Write D0h

Read data from

another block

Program

Start

Write B0h

Erase Complete

Write FFh

Read Data

erase_suspend_command ( ) {

writeToFlash (any_address, 0xB0) ;

writeToFlash (any_address, 0x70) ;

/* read status register to check if

erase has already completed */

do {

status_register=readFlash (any_address) ;

/* E or G must be toggled*/

} while (status_register.b7== 0) ;

if (status_register.b6==0) /*erase completed */

{ writeToFlash (any_address, 0xFF) ;

read_data ( ) ;

/*read data from another block*/

/*The device returns to Read Array

(as if program/erase suspend was not issued).*/

}

else

{ writeToFlash (any_address, 0xFF) ;

read_program_data ( );

/*read or program data from another address*/

writeToFlash (any_address, 0xD0) ;

/*write 0xD0 to resume erase*/

}

Write FFh

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