M28W320 データシートの表示（PDF） - STMicroelectronics

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M28W320

32 Mbit (2Mb x16, Boot Block) 3V Supply Flash Memory

STMicroelectronics 

M28W320FCT, M28W320FCB

Flowcharts and pseudo codes

Figure 23. Protection Register Program Flowchart and Pseudo Code

Start

Write C0h

protection_register_program_command (addressToProgram, dataToProgram) {:

writeToFlash (any_address, 0xC0) ;

Write Address

& Data

Read Status

Register

writeToFlash (addressToProgram, dataToProgram) ;

/*Memory enters read status state after

the Program Command*/

do {

status_register=readFlash (any_address) ;

/* E or G must be toggled*/

NO

b7 = 1

YES

NO

b3 = 0

YES

NO

b4 = 0

YES

NO

b1 = 0

YES

End

VPP Invalid

Error (1, 2)

Program

Error (1, 2)

Program to Protected

Block Error (1, 2)

} 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 ( ) ;

}

AI04381

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.

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