M28W320EBT Datasheet, PDF (37/45 Pages) STMicroelectronics – 32 Mbit (2Mb x16, Boot Block) 3V Supply Flash Memory

APPENDIX C. FLOWCHARTS AND PSEUDO CODES
Figure 16. Program Flowchart and Pseudo Code
M28W320EBT, M28W320EBB
Start
Write 40h or 10h
Write Address
& Data
Read Status
Register
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)
program_command (addressToProgram, dataToProgram) {:
writeToFlash (any_address, 0x40) ;
/*or writeToFlash (any_address, 0x10) ; */
writeToFlash (addressToProgram, dataToProgram) ;
/*Memory enters read status state after
the Program Command*/
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 ( ) ;
if (status_register.b4==1) /*program error */
error_handler ( ) ;
if (status_register.b1==1) /*program to protect block error */
error_handler ( ) ;
}
AI03538b
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.
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