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???
02/14/06 15:11
Modified:
  02/14/06 15:12
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 		 #109955 - difference
Responding to: ???'s previous message
Erik Malund said:
For another Atmel ( the AT29C020 ) it is as I described. This, of course is no guarantee it is so for all bytewise flashes.

The 29C020 is NOT a bytewise flash; contrary; it IS a strictly blockwise flash, modifying the whole block at once even if only one byte is written (with the difference to AT89C51xD2, that it does not preserve the unwritten data).
AT29C020 datasheet said:
Any byte that is not loaded during the programming of its sector will be indeterminate.


But I am now more inclined to believe the AT89C51xD2 does include an erase cycle even if not needed - however, I have no proof for or against this.


JW


List of 34 messages in thread
TopicAuthorDate
iap            01/01/70 00:00      
   Do you really care for our answers?            01/01/70 00:00      
      wasted time            01/01/70 00:00      
   no, all flash is block erase.            01/01/70 00:00      
   datasheet            01/01/70 00:00      
      manufacturer            01/01/70 00:00      
         please reply jan            01/01/70 00:00      
            AT89C51ED2            01/01/70 00:00      
               AT89C51ED2 EEPROM            01/01/70 00:00      
                  matter of how is it used            01/01/70 00:00      
                     For another Atmel            01/01/70 00:00      
                        difference            01/01/70 00:00      
                           you are right, not byte, but autoerase            01/01/70 00:00      
         that is the reason NOT to use "bytewise"            01/01/70 00:00      
            thankyou            01/01/70 00:00      
      Harshad. need your help            01/01/70 00:00      
         ask your problem here            01/01/70 00:00      
            ask on 8052.com            01/01/70 00:00      
            i am a new bee in this line            01/01/70 00:00      
               How about this forum?            01/01/70 00:00      
                  nitpicking            01/01/70 00:00      
                     Was that a pun?            01/01/70 00:00      
                        no, Kalpak            01/01/70 00:00      
                           A common mistake?            01/01/70 00:00      
                              I don't, a mistype            01/01/70 00:00      
   iap p89v51rd2            01/01/70 00:00      
      FCF not set properly            01/01/70 00:00      
   iap p89v51rd2            01/01/70 00:00      
      IAP            01/01/70 00:00      
   please help            01/01/70 00:00      
      elnec            01/01/70 00:00      
   It is, indeed, amazing            01/01/70 00:00      
      what is the relevancy?            01/01/70 00:00      
         youir post 14/Feb/06 6:07 am            01/01/70 00:00      

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