Use the MPU Region Attribute and Size Register to define the size, access behaviour and memory type of the region identified by MPU_RNR, and enable that region.
| ENABLE | Enables the region. |
| SIZE | Indicates the region size. Region size in bytes = 2^(SIZE+1). The minimum permitted value is 7 (b00111) = 256Bytes |
| SRD | Subregion Disable. For regions of 256 bytes or larger, each bit of this field controls whether one of the eight equal subregions is enabled. |
| ATTRS | The MPU Region Attribute field. Use to define the region attribute control. 28 = XN: Instruction access disable bit: 0 = Instruction fetches enabled. 1 = Instruction fetches disabled. 26:24 = AP: Access permission field 18 = S: Shareable bit 17 = C: Cacheable bit 16 = B: Bufferable bit |