FLASH security status register programming
NVSTATE | Non-volatile state programming Write to change corresponding bits in FLASH_NVSR register: Actual option byte change from close to open is triggered only after memory clear hardware process is confirmed. When NVSTATE=0xB4 (resp. 0x51) writing any other value than 0x51 (resp. 0xB4) triggers an option byte change error (OPTERRF). 81 (B_0x51): CLOSE 180 (B_0xB4): OPEN |