4.5.3. MPU Region Number Register
The MPU_RNR selects which memory region is referenced by the
MPU_RBAR and MPU_RASR registers. See the register summary in Table 4.38 for its
attributes. The bit assignments are:
Table 4.41. MPU_RNR bit assignments
| Bits | Name | Function |
|---|
| [31:8] | - | Reserved. |
| [7:0] | 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, you write the required region number to this register
before accessing the MPU_RBAR or MPU_RASR. However you can change
the region number by writing to the MPU RBAR with the VALID bit
set to 1, see MPU Region Base Address Register.
This write updates the value of the REGION field.
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