Atmel ARM-Based Evaluation Kit for SAM4S16C, 32-Bit ARM® Cortex® Microcontroller ATSAM4S-WPIR-RD ATSAM4S-WPIR-RD Data Sheet

Product codes

ATSAM4S-WPIR-RD

SAM4S Series [DATASHEET]

Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14

260

12.11.2.11MPU Region Attribute and Size Register Alias 3

Name:

MPU_RASR_A3

Access:

Read

/Write

Reset:

0x00

000000

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.
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.

–

TEX

SRD

–

SIZE

ENABLE