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FSPL Type01 & DFL Type04: Can you rewrite data after writing 0xFF?

Latest Updated:12/05/2014

Question:

In using one of the following libraries to write data to the flash memory of an RL78-family product, is it possible to rewrite the data after writing 0xFF?

  • Flash Self Programming Library Type01
  • Data Flash Library Type04

Answer:

If the data are not written while the flash memory is in the blank state but new data are written after 0xFF has been written, this will still be additional writing (overwriting), which is prohibited, although it does not cause a write error.
Only write data after erasing the flash memory (while the memory is in the blank state).
Suitable Products
Flash Self Programming Libraries
Data Flash Libraries