Atmel SAM4S-XPLD Atmel ATSAM4S-XPLD ATSAM4S-XPLD Hoja De Datos

 226

SAM4S [DATASHEET]

11100E–ATARM–24-Jul-13

MPU_RASR

Access: Read-write

Reset: 0x00000000 

The MPU_RASR defines the region size and memory attributes of the MPU region specified by the MPU_RNR, and enables that 
region and any subregions.

MPU_RASR is accessible using word or halfword accesses:

• The most significant halfword holds the region attributes.

• The least significant halfword holds the region size, and the region and subregion enable bits.

0: Instruction fetches enabled.

1: Instruction fetches disabled.

See 

See 

See 

For each bit in this field:

0: Corresponding sub-region is enabled.

1: Corresponding sub-region is disabled.

See 

Region sizes of 128 bytes and less do not support subregions. When writing the attributes for such a region, write the SRD field 
as 0x00.

31

30

29

28

27

26

25

24

–

XN

–

AP

23

22

21

20

19

18

17

16

–

TEX

S

C

B

15

14

13

12

11

10

9

8

SRD

7

6

5

4

3

2

1

0

–

SIZE

ENABLE