RM0367 Rev 7 113/1043
RM0367 Flash program memory and data EEPROM (FLASH)
122
3.7.6 Option bytes unlock key register (FLASH_OPTKEYR)
Address offset: 0x14
Reset value: 0x0000 0000
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
FLASH_OPTKEYR[31:16]
wwwwww w wwwwwww w w
1514131211109 8765432 1 0
FLASH_OPTKEYR[15:0]
wwwwww w wwwwwww w w
Bits 31:0 This is a write-only register. With a sequence of two write operations (the first one with
0xFBEAD9C8 and the second one with 0x24252627), the write size being that of a word, it is
possible to unlock the Option bytes area and the OBL_LAUNCH bit. The sequence can only be
executed when PELOCK is already unlocked. For more details, refer to Unlocking the Option
bytes area.
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