Panasonic MN101C77C User Manual

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Chapter 18    Flash EEPROM

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

 

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.