Datasheet

241
SAM4S Series [DATASHEET]
11100F–ATARM–29-Jan-14
12.11.2.3 MPU 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_RASRs.
• REGION: MPU Region 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. However, the
region number can be changed by writing to the MPU_RBAR with the VALID bit set to 1; see “MPU Region Base Address Regis-
ter” . 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
–
76543210
REGION