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Flash program memory and data EEPROM (FLASH) RM0367

112/1043 RM0367 Rev 7

3.7.3 Power-down key register (FLASH_PDKEYR)

Address offset: 0x08

Reset value: 0x0000 0000

3.7.4 PECR unlock key register (FLASH_PEKEYR)

Address offset: 0x0C

Reset value: 0x0000 0000

3.7.5 Program and erase key register (FLASH_PRGKEYR)

Address offset: 0x10

Reset value: 0x0000 0000

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

FLASH_PDKEYR[31:16]

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15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

FLASH_PDKEYR15:0]

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Bits 31:0 This is a write-only register. With a sequence of two write operations (the first one with

0x04152637 and the second one with 0xFAFBFCFD), the write size being that of a word, it is

possible to unlock the RUN_PD bit of the FLASH_ACR register. For more details, refer to

Section 3.6.4: Power-down.

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

FLASH_PEKEYR[31:16]

wwwwww w w www www ww

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

FLASH_PEKEYR15:0]

wwwwww w w www www ww

Bits 31:0 This is a write-only register. With a sequence of two write operations (the first one with

0x89ABCDEF and the second one with 0x02030405), the write size being that of a word, it is

possible to unlock the FLASH_PECR register. For more details, refer to Unlocking the data

EEPROM and the FLASH_PECR register.

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

FLASH_PRGKEYR[31:16]

wwwwww w w www www ww

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

FLASH_PRGKEYR15:0]

wwwwww w w www www ww

Bits 31:0 This is a write-only register. With a sequence of two write operations (the first one with

0x8C9DAEBF and the second one with 0x13141516), the write size being that of a word, it is

possible to unlock the Flash program memory. The sequence can only be executed when

PELOCK is already unlocked. For more details, refer to Unlocking the Flash program memory.

ST STM32L0x3 User Manual

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