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 224

SAM4S [DATASHEET]

11100E–ATARM–24-Jul-13

MPU_RNR

Access: Read-write

Reset: 0x00000800 

The MPU_RNR selects which memory region is referenced by the MPU_RBAR and MPU_RASR registers.

Indicates the MPU region referenced by the MPU_RBAR and MPU_RASR registers.

The MPU supports 8 memory regions, so the permitted values of this field are 0-7.

Normally, the required region number is written to this register before accessing the MPU_RBAR or MPU_RASR. However, the 
region number can be changed by writing to the MPU_RBAR with the VALID bit set to 1; see 

. This write updates the value of the REGION field.

31

30

29

28

27

26

25

24

–

23

22

21

20

19

18

17

16

–

15

14

13

12

11

10

9

8

–

7

6

5

4

3

2

1

0

REGION