M28W320FST datasheet(51/55 Pages) STMICROELECTRONICS

No de pièce	M28W320FST

Description	32Mbit (2Mb x16) and 64Mbit (4Mb x16) 3V Supply, Boot Block, Secure Flash Memories

PDF	55 Pages

Scroll/Zoom	100%

Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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51 / 55 page

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M28W320FST, M28W320FSB, M28W640FST, M28W640FSB

Figure 21. Protection Register Program Flowchart and Pseudo Code

Note: 1. Status check of b1 (Protected Block), b3 (VPP Invalid) and b4 (Program Error) can be made after each program operation or after

a sequence.

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

Write C0h

AI04381

Start

Write Address

& Data

Read Status

YES

b7 = 1

YES

b3 = 0

b4 = 0

VPP Invalid

Error (1, 2)

Program

Error (1, 2)

protection_register_program_command (addressToProgram, dataToProgram) {:

writeToFlash (any_address, 0xC0) ;

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 ( ) ;

YES

End

YES

b1 = 0

Program to Protected

Block Error (1, 2)

writeToFlash (addressToProgram, dataToProgram) ;

/*Memory enters read status state after

the Program Command*/

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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