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M28W640FCB датащи(PDF) 71 Page - STMicroelectronics

номер детали M28W640FCB
подробное описание детали  64 Mbit (4Mbx16, Boot Block) 3V Supply Flash memory
PDF  77 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M28W640FCB датащи(HTML) 71 Page - STMicroelectronics

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M28W640FCT, M28W640FCB
Flowcharts and pseudo codes
71/77
Figure 23.
Protection Register Program flowchart and pseudo code
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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