Atmel Xplained Pro Evaluation Kit ATSAM4E-XPRO ATSAM4E-XPRO Fiche De Données
Codes de produits
ATSAM4E-XPRO
269
SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
Usually, a microcontroller system has only a single processor and no caches. In such a system, program the MPU
as follows:
as follows:
In most microcontroller implementations, the shareability and cache policy attributes do not affect the system
behavior. However, using these settings for the MPU regions can make the application code more portable. The
values given are for typical situations. In special systems, such as multiprocessor designs or designs with a
separate DMA engine, the shareability attribute might be important. In these cases, refer to the recommendations
of the memory device manufacturer.
behavior. However, using these settings for the MPU regions can make the application code more portable. The
values given are for typical situations. In special systems, such as multiprocessor designs or designs with a
separate DMA engine, the shareability attribute might be important. In these cases, refer to the recommendations
of the memory device manufacturer.
Table 12-40.
Memory Region Attributes for a Microcontroller
Memory Region
TEX
C
B
S
Memory Type and Attributes
Flash memory
b000
1
0
0
Normal memory, non-shareable, write-through
Internal SRAM
b000
1
0
1
Normal memory, shareable, write-through
External SRAM
b000
1
1
1
Normal memory, shareable, write-back, write-allocate
Peripherals
b000
0
1
1
Device memory, shareable