ATSAM3U-EK Atmel, ATSAM3U-EK Datasheet - Page 220

• 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

Region enable bit.
For information about access permission, see
13.22.5.1
13.22.6
220
SAM3U Series
MPU access permission attributes
SIZE field values
The SIZE field defines the size of the MPU memory region specified by the RNR. as follows:
The smallest permitted region size is 32B, corresponding to a SIZE value of 4.
example SIZE values, with the corresponding region size and value of N in the RBAR.
Table 13-36. Example SIZE field values
1.
This section describes the MPU access permission attributes. The access permission bits, TEX,
C, B, S, AP, and XN, of the RASR, control access to the corresponding memory region. If an
access is made to an area of memory without the required permissions, then the MPU generates
a permission fault.
Table 13-37
Table 13-37. TEX, C, B, and S encoding
SIZE value
b00100 (4)
b01001 (9)
b10011 (19)
b11101 (29)
b11111 (31)
TEX
b000
In the RBAR, see
(Region size in bytes) = 2
C
0
1
page
shows the encodings for the TEX, C, B, and S access permission bits.
B
0
1
0
1
Region size
32B
1KB
1MB
1GB
4GB
218.
“MPU access permission
S
x
x
0
1
0
1
(1)
(1)
“MPU Region Base Address Register” on
Memory type
Strongly-
ordered
Device
Normal
Normal
Value of
N
5
10
20
30
b01100
(1)
(SIZE+1)
Shareability
Shareable
Shareable
Not
shareable
Shareable
Not
shareable
Shareable
Note
Minimum permitted
size
-
-
-
Maximum possible
size
attributes”.
Other attributes
-
-
Outer and inner write-through. No write
allocate.
Outer and inner write-back. No write
allocate.
6430D–ATARM–25-Mar-11
Table 13-36
gives