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Chapter 18 Flash EEPROM
Reprogramming Flow
18-4 Reprogramming Flow
Figure 18-4-1 shows the flow for reprogramming (erasing and programming) the flash EEPROM.
As the figure shows, the User Data Program starts after the memory is erased.
Figure 18-4-1 Reprogramming Flow of Internal Flash EEPROM
START
Power ON Sequence
Erase
Check
Erase
User Data
Program
Power OFF Sequence
OK
END
Read / Standby
Start write routine (User Data Program) only after erase routine is completely finished. How-
ever, you can program our product which is already erased without this process. For other
products, the erase rouine is necessary, because the erase level may be incompleted even
though the test result of "blank check" is "Pass". In such case, reliability of the written data
may be damaged even when the write is finished normaly. Also additional write to the ad-
dress which is already written is forbidden.