ST STM32L4x6 User Manual

Embedded Flash memory (FLASH) RM0351
108/1693 DocID024597 Rev 3
3.7.4 Flash option key register (FLASH_OPTKEYR)
Address offset: 0x0C
Reset value: 0x0000 0000
Access: no wait state, word access
3.7.5 Flash status register (FLASH_SR)
Address offset: 0x10
Reset value: 0x0000 0000
Access: no wait state, word, half-word and byte access
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
KEYR[31:16]
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15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
KEYR[15:0]
wwwwwww wwwwwww ww
Bits 31:0 KEYR: Flash key
The following values must be written consecutively to unlock the FLACH_CR
register allowing flash programming/erasing operations:
KEY1: 0x45670123
KEY2: 0xCDEF89AB
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
OPTKEYR[31:16]
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15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
OPTKEYR[15:0]
wwwwwww wwwwwww ww
Bits 31:0 OPTKEYR: Option byte key
The following values must be written consecutively to unlock the FLACH_OPTR
register allowing option byte programming/erasing operations:
KEY1: 0x08192A3B
KEY2: 0x4C5D6E7F
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. BSY
r
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
OPTV
ERR
RD
ERR
Res. Res. Res. Res.
FAST
ERR
MISS
ERR
PGS
ERR
SIZ
ERR
PGA
ERR
WRP
ERR
PROG
ERR
Res.
OP
ERR
EOP
rc_w1 rc_w1 rc_w1 rc_w1 rc_w1 rc_w1 rc_w1 rc_w1 rc_w1 rc_w1 rc_w1

ST STM32L4x6 Specifications

General

Brand	ST
Model	STM32L4x6
Category	Microcontrollers
Language	English