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d flash memory re-programming : Query : help

Question asked by ruby krishna on Jul 14, 2014
Latest reply on Jul 16, 2014 by DPB

Hi All,

Currently i'm using MC9S12xhy controller, where d flash is used instead of external EEprom.

 

As per my understanding, i will erase the the necessary d-flash sector in  my first operation cycle .According to the controller specification i can erase D-FLASH in  terms sectors  whereas i can  write it  in word-word basis.

 

Controller document advice us to keep the wod or phrase in erased state before programming it.

 

In case i need to re program only one particular word in a sector, then i need take the RAM copy  of the d flash sector ,erase the whole sector,update the RAM copy with the new change and then program it.

 

I'm confused..is it necessary to  erase for every re-programming?

 

Please helpe me on this regard!

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