Atmel SAM4S Xplained Pro Starter and Evaluation Kit ATSAM4S-XPRO ATSAM4S-XPRO Data Sheet

249

SAM4S Series [DATASHEET]

Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14

MPU_RNR

 Read

/Write

 0x00

000800 

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

Indicates the MPU region referenced by the MPU_RBAR and MPU_RASRs.
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. How-

ever, 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