Chapter 18 Flash EEPROM

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.

START

Power ON Sequence

Erase OK

Check

Erase

User Data

Program

Read / Standby

Power OFF Sequence

END

Figure 18-4-1 Reprogramming Flow of Internal Flash EEPROM

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.

Reprogramming Flow

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Panasonic F77G, MN101C77C user manual Reprogramming Flow of Internal Flash Eeprom