Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO Data Sheet
Product codes
ATSAM4E-XPRO
279
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
12.11.2.7 MPU Region Attribute and Size Register Alias 1
Name:
MPU_RASR_A1
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.
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.
XN: Instruction Access Disable
0: Instruction fetches enabled.
1: Instruction fetches disabled.
AP: Access Permission
See
.
TEX, C, B: Memory Access Attributes
See
.
S: Shareable
See
.
SRD: Subregion Disable
For each bit in this field:
0: Corresponding subregion is enabled.
1: Corresponding subregion is disabled.
See
for more information.
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.
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