PM0073

Register descriptions

Doc ID 17766 Rev 5

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3.6

Flash address register (FLASH_AR)

Address offset: 0x14

Reset value: 0x0000 0000

Updated by hardware with the currently/last used address. For Page Erase operations, this

should be updated by software to indicate the chosen page.

3.7

Option byte register (FLASH_OBR)

Address offset 0x1C

Reset value: 0x03FF FFFC

Note:

The reset value of this register depends on the value programmed in the option byte and the

OPTERR bit reset value depends on the comparison of the option byte and its complement

during the option byte loading phase.

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

FAR[31:16]

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15

14

13

12

11

10

9

8

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32

1

0

FAR[15:0]

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Bits 31:0

FAR: Flash Address

Chooses the address to program when programming is selected, or a page to erase when

Page Erase is selected.

Note: Write access to this register is blocked when the BSY bit in the FLASH_SR register is

set.

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

15

14

13

12

11

10

98765432

10

Reserved

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Bits 31:2 Reserved, must be kept cleared.

Bit 1

RDPRT: Read protection

When set, this indicates that the Flash memory is read-protected.

Note: This bit is read-only.

Bit 0

OPTERR: Option byte error

When set, this indicates that the loaded option byte and its complement do not match. The

corresponding byte and its complement are read as 0xFF in the FLASH_OBR or

FLASH_WRPR register.

Note: This bit is read-only.