ATSAM3U-EK Atmel, ATSAM3U-EK Datasheet - Page 219

• Manufacturer Part Number: ATSAM3U-EK
• Description: KIT EVAL FOR AT91SAM3U CORTEX
• Manufacturer: Atmel
• Type: MCUr

Specifications of ATSAM3U-EK

• Contents: Board
• Processor To Be Evaluated: SAM3U
• Data Bus Width: 32 bit
• Interface Type: RS-232, USB
• Operating Supply Voltage: 3 V
• Silicon Manufacturer: Atmel
• Core Architecture: ARM
• Core Sub-architecture: Cortex - M3
• Silicon Core Number: SAM3U4E
• Silicon Family Name: SAM3U
• Kit Contents: Board CD Docs
• Rohs Compliant: Yes
• For Use With/related Products: AT91SAM3U
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

13.22.5
• XN
Instruction access disable bit:
0 = instruction fetches enabled
1 = instruction fetches disabled.
• AP
Access permission field, see
• TEX, C, B
Memory access attributes, see
• S
Shareable bit, see
• SRD
Subregion disable bits. For each bit in this field:
0 = corresponding sub-region is enabled
1 = corresponding sub-region is disabled
See
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.
• SIZE
Specifies the size of the MPU protection region. The minimum permitted value is 3 (b00010), see See
on page 220
• ENABLE
6430D–ATARM–25-Mar-11
“Subregions” on page 224
31
23
15
7
MPU Region Attribute and Size Register
Reserved
Reserved
for more information.
Reserved
Table 13-36 on page
30
22
14
6
The RASR defines the region size and memory attributes of the MPU region specified by the
RNR, and enables that region and any subregions. See the register summary in
page 213
RASR is accessible using word or halfword accesses:
The bit assignments are:
• the most significant halfword holds the region attributes
• the least significant halfword holds the region size and the region and subregion enable bits.
Table 13-39 on page
Table 13-37 on page
for more information.
for its attributes.
29
21
13
5
220.
221.
TEX
XN
28
20
12
220.
4
SRD
Reserved
SIZE
27
19
11
3
26
18
10
S
2
SAM3U Series
AP
25
17
C
9
1
“SIZE field values”
Table 13-35 on
ENABLE
24
16
B
8
0
219