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eric4
Visitor II
January 10, 2005
Question

ST10F269 Flash Read Failure...

  • January 10, 2005
  • 1 reply
  • 613 views
Posted on January 10, 2005 at 08:49

ST10F269 Flash Read Failure...

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    eric4Author
    Visitor II
    January 10, 2005
    Posted on January 10, 2005 at 08:49

    Morning everyone!

    I have a problem with my ST10 flash:

    I program unused locations in the chip to 0xFF i.e. same as erased value. A periodic check of the complete flash chip sometimes reads a 0xFF value as 0x7F (this happens on average once every 5 times the memory is checked, but typically is random).

    Is it possible that when programming an already erased location to 0xFF, that there can be a smaller charge applied holding the state of the flash 'bit' than if I program the value with, e.g. 0x00?

    And could this explain why I sometimes read a 0x7F when I should be reading 0xFF?

    Thanks all,

    Eric Watson

    :-[

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