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I'm using stm32l073 board, and doing delta update for OTA, that need write single byte to flash, but I check the example there write to flash by using double word(4 bytes). Can write single byte to flash? or can't?
that depends entirely on the ST hardware implementation - it has nothing to do with Keil or ARM.
You need to consult the stm32l073 chip documentation for details of its flash implementation and capabilities.
www.st.com/.../stm32l073rz.html
Note the link there for ST's Support & Community.
OK. thanks for your reply. I will ask the ST for support.
Be sure to study their documentation first!