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STM32F2xx FLASH erease program

Question asked by on Apr 4, 2013
Latest reply on Apr 4, 2013 by
I have problem erease the write to the FLASH .
I do as follow
   FLASH_EraseSector(FLASH_Sector_4, VoltageRange_3);
Prair to that I check that all  section are unlock nWRP= 0xFFF.
I use HSE and I read that in STM32F1xx it should use HSI (in PM0042) but not mention in STM32F2xx program manual PM0059. Does it true?
When I do erease all it work.
What could be the reasone?