Atmel SAM4S-EK2 Atmel ATSAM4S-EK2 ATSAM4S-EK2 Data Sheet
Product codes
ATSAM4S-EK2
224
SAM4S [DATASHEET]
11100E–ATARM–24-Jul-13
12.11.2.3MPU Region Number Register
Name:
MPU_RNR
Access: Read-write
Reset: 0x00000800
The MPU_RNR selects which memory region is referenced by the MPU_RBAR and MPU_RASR registers.
• REGION
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
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