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參數資料
| 型號： | EFM32-TG-STK3300 |
| 廠商： | Energy Micro |
| 文件頁數： | 28/136頁 |
| 文件大?。?/td> | 0K |
| 描述： | KIT STARTER EFM32 GECKO |
| 特色產品： | EFM32 Tiny Gecko |
| 標準包裝： | 1 |
| 系列： | EFM®32 |
| 類型： | MCU |
| 適用于相關產品： | EFM32-TGXXX |
| 所含物品： | 板，線纜，CD 和文檔 |
| 其它名稱： | 914-1018 |
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...the world's most energy friendly microcontrollers
2011-02-04 - d0002_Rev1.00
123
www.energymicro.com
bit of SRD controls the first subregion, and the most significant bit controls the last subregion. Disabling
a subregion means another region overlapping the disabled range matches instead. If no other enabled
region overlaps the disabled subregion the MPU issues a fault.
Regions of 32, 64, and 128 bytes do not support subregions, With regions of these sizes, you must set
the SRD field to 0x00, otherwise the MPU behavior is Unpredictable.
4.5.8.3.1 Example of SRD use
Two regions with the same base address overlap. Region one is 128KB, and region two is 512KB. To
ensure the attributes from region one apply to the first128KB region, set the SRD field for region two to
b00000011 to disable the first two subregions, as the figure shows.
Region 1
Disabled subregion
Region 2, wit h
subregions
Base address of bot h regions
Offset from
base address
0
64KB
128KB
192KB
256KB
320KB
384KB
448KB
512KB
4.5.9 MPU design hints and tips
To avoid unexpected behavior, disable the interrupts before updating the attributes of a region that the
interrupt handlers might access.
Ensure software uses aligned accesses of the correct size to access MPU registers:
except for the RASR, it must use aligned word accesses
for the RASR it can use byte or aligned halfword or word accesses.
The processor does not support unaligned accesses to MPU registers.
When setting up the MPU, and if the MPU has previously been programmed, disable unused regions to
prevent any previous region settings from affecting the new MPU setup.
4.5.9.1 MPU configuration for a microcontroller
The EFM32 devices has only a single processor and information on Shareability and cache behavior is
not used. In such a system, program the MPU as follows:
Table 4.48. Memory region attributes for a microcontroller
Memory region
TEX
C
B
S
Memory type and attributes
Flash memory
b000
1
0
Normal memory, Non-shareable, write-through
Internal SRAM
b000
1
0
1
Normal memory, Shareable, write-through
External SRAM
b000
1
Normal memory, Shareable, write-back, write-allocate
Peripherals
b000
0
1
Device memory, Shareable
In the EFM32 devices 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 and
also be useful for setups with the DMA Controller. The values given are for typical situations.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| EFM32TG-STK3300 | 制造商:Energy Micro AS 功能描述:STARTER KIT STK3300 TINY GEC 制造商:Energy Micro AS 功能描述:STARTER KIT, STK3300, TINY GECKO; Silicon Manufacturer:Energy Micro; Core Architecture:ARM; Core Sub-Architecture:Cortex-M3; Silicon Core Number:EFM32TG840; Silicon Family Name:EFM32; Kit Contents:Starter Kit EFM32TG840; SVHC:No SVHC;RoHS Compliant: Yes |
| EFM32WG230F128 | 功能描述:ARM微控制器 - MCU 128kb flash 32kb RAM RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 處理器系列:STM32F373xx 數據總線寬度:32 bit 最大時鐘頻率:72 MHz 程序存儲器大小:256 KB 數據 RAM 大小:32 KB 片上 ADC:Yes 工作電源電壓:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:LQFP-48 安裝風格:SMD/SMT |
| EFM32WG230F128-QFN64 | 制造商:Energy Micro AS 功能描述:32 BIT ARM MPU, WONDER GECKO - Tape and Reel 制造商:Energy Micro AS 功能描述:IC MCU 32BIT 128KB FLASH 64QFN |
| EFM32WG230F128-QFN64T | 制造商:Energy Micro AS 功能描述:WONDER GECKO 32 BIT ARM CORTEX MCU - Trays |
| EFM32WG230F128-QFN64-T | 制造商:Energy Micro AS 功能描述:IC MCU 32BIT 128KB FLASH 64QFN |
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