Flash Key Register (Flash_Keyr); Flash Option Key Register (Flash_Optkeyr) - ST STM32G4 Series Reference Manual

RM0440
3.7.3

Flash key register (FLASH_KEYR)

Address offset: 0x08
Reset value: 0x0000 0000
Access: no wait state, word access
31 30 29
w w w
15 14 13
w w w
Bits 31:0 KEYR: Flash key
3.7.4

Flash option key register (FLASH_OPTKEYR)

Address offset: 0x0C
Reset value: 0x0000 0000
Access: no wait state, word access
31 30 29
w w w
15 14 13
w w w
Bits 31:0 OPTKEYR: Option byte key
Embedded Flash memory (FLASH) for category 3 devices
28 27 26 25
w w w w
12 11 10 9
w w w w
The following values must be written consecutively to unlock the FLACH_CR
register allowing flash programming/erasing operations:
KEY1: 0x4567 0123
KEY2: 0xCDEF 89AB
28 27 26 25
w w w w
12 11 10 9
w w w w
The following values must be written consecutively to unlock the FLACH_OPTR
register allowing option byte programming/erasing operations:
KEY1: 0x0819 2A3B
KEY2: 0x4C5D 6E7F
24 23 22
KEYR[31:16]
w w w
8 7 6
KEYR[15:0]
w w w
24 23 22
OPTKEYR[31:16]
w w w
8 7 6
OPTKEYR[15:0]
w w w
RM0440 Rev 1
21 20 19 18
w w w w
5 4 3 2
w w w w
21 20 19 18
w w w w
5 4 3 2
w w w w
17 16
w w
1 0
w w
17 16
w w
1 0
w w
127/2083
185