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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 it necessary to  erase for every re-programming?


Please helpe me on this regard!