After I erased the flash in STM32L073RZ when I looked at the flash using the cube program, the memory values are 00000000. I checked the same thing with STM32WB55 and its values are FFFFFFFF. why it is different?

[Uwe Bonnes · Accepted solution]

Erased state of L0 and L1 is 0, all other STM32 I know have erased state 0xff

[Peter BENSCH]

The reason for what @Uwe Bonnes​ said is the technology of the Non Volatile Memory (NVM):

• STM32L0/L1 uses EEPROM (erased = 0) with organization in bytes
• other STM32 use Flash (erased = 1) with organization in sectors

Regards

/Peter

[MImda.1]

thank you so much. It cleared my knowledge