M28W640ECT datasheet(51/55 Pages) STMICROELECTRONICS

Part #	M28W640ECT

Description	64 Mbit 4Mb x16, Boot Block 3V Supply Flash Memory

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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M28W640ECT, M28W640ECB

Figure 24. 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

Register

YES

NO

b7 = 1

YES

NO

b3 = 0

NO

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

NO

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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