EFM32G-DK3550【PDF 15/467 页】KIT DEVELOPMENT EFM32 GECKO

您好，
买卖IC网欢迎您。
请登录
免费注册

11页 12页 13页 14页 [15页]16页 17页 18页 19页

...the world's most energy friendly microcontrollers

The embedded SRAM is located at address 0x20000000 in the memory map of the EFM32G. When

running code located in SRAM starting at this address, the Cortex-M3 uses the System bus interface to

fetch instructions. This results in reduced performance as the Cortex-M3 accesses stack, other data in

SRAM and peripherals using the System bus interface. To be able to run code from SRAM efficiently,

the SRAM is also mapped in the code space at address 0x10000000. When running code from this

space, the Cortex-M3 fetches instructions through the I/D-Code bus interface, leaving the System bus

interface for data access. The SRAM mapped into the code space can however only be accessed by

the CPU, i.e. not the DMA.

5.2.1 Bit-banding

The SRAM bit-band alias and peripheral bit-band alias regions are located at 0x22000000 and

0x42000000 respectively. Read and write operations to these regions are converted into masked single-

bit reads and atomic single-bit writes to the embedded SRAM and peripherals of the EFM32G.

Using a standard approach to modify a single register or SRAM bit in the aliased regions, would require

software to read the value of the byte, half-word or word containing the bit, modify the bit, and then

write the byte, half-word or word back to the register or SRAM address. Using bit-banding, this can be

done in a single operation. As read-writeback, bit-masking and bit-shift operations are not necessary in

software, code size is reduced and execution speed improved.

The bit-band regions allow each bit in the SRAM and Peripheral areas of the memory map to be

addressed. To set or clear a bit in the embedded SRAM, write a 1 or a 0 to the following address:

Memory SRAM Area Set/Clear Bit

bit_address = 0x22000000 + (address – 0x20000000) × 32 + bit × 4

(5.1)

where address is the address of the 32-bit word containing the bit to modify, and bit is the index of the

bit in the 32-bit word.

To modify a bit in the Peripheral area, use the following address:

Memory Peripheral Area Bit Modification

bit_address = 0x42000000 + (address – 0x40000000) × 32 + bit × 4

(5.2)

5.2.2 Peripherals

The peripherals are mapped into the peripheral memory segment, each with a fixed size address range

according to Table 5.1 (p. 16) , Table 5.2 (p. 16) , and Table 5.3 (p. 17)

2011-04-12 - d0001_Rev1.10

15

www.energymicro.com

发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

*型号	*数量	厂商	批号	封装

添加更多采购

我的联系方式

*

*

*

相关PDF资料

EFM32GG-STK3700 KIT STARTER GIANT GECKO

EFM32LG-DK3650 KIT DEV EFM32 LEOPARD GECKO

EK-K7-KC705-CES-G-J KINTEX-7 FPGA KC705 EVAL KIT

EK-S6-SP601-G KIT EVAL SPARTAN 6 SP601

EK-S6-SP605-G KIT EVAL SPARTAN 6 SP605

EK-V6-ML631-G-J VIRTEX-6 HXT FPGA ML631 EVAL KIT

EK-V7-VC707-CES-G VIRTEX-7 VC707 EVAL KIT

EK-Z7-ZC702-CES-G ZYNQ-7000 EPP ZC702 EVAL KIT

相关代理商/技术参数

EFM32GG230F1024 功能描述:ARM微控制器 - MCU 1024KB FL 128KB RAM RoHS:否制造商:STMicroelectronics 核心:ARM Cortex M4F 处理器系列:STM32F373xx 数据总线宽度:32 bit 最大时钟频率:72 MHz 程序存储器大小:256 KB 数据 RAM 大小:32 KB 片上 ADC:Yes 工作电源电压:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:LQFP-48 安装风格:SMD/SMT

EFM32GG230F1024G-E-QFN64R 功能描述:IC MCU 32BIT 1MB FLASH 64QFN 制造商:silicon labs 系列:Giant Gecko 包装:剪切带（CT）零件状态:在售核心处理器:ARM? Cortex?-M3 核心尺寸:32-位速度:48MHz 连接性:I2C，IrDA，智能卡，SPI，UART/USART 外设:欠压检测/复位，DMA，POR，PWM，WDT I/O 数:56 程序存储容量:1MB（1M x 8）程序存储器类型:闪存 EEPROM 容量:- RAM 容量:128K x 8 电压 - 电源（Vcc/Vdd）:1.98 V ~ 3.8 V 数据转换器:A/D 8x12b，D/A 2x12b 振荡器类型:内部工作温度:-40°C ~ 85°C（TA）封装/外壳:64-VFQFN 裸露焊盘供应商器件封装:64-QFN（9x9）标准包装:1

EFM32GG230F1024-QFN64 制造商:Energy Micro AS 功能描述:GIANT GECKO MCU - Cut TR (SOS) 制造商:Energy Micro 功能描述:GIANT GECKO MCU 制造商:Energy Micro AS 功能描述:IC MCU 32BIT 1MB FLASH 64QFN

EFM32GG230F1024-QFN64T 制造商:Energy Micro AS 功能描述:GIANT GECKO MCU - Trays

EFM32GG230F1024-QFN64-T 制造商:Energy Micro AS 功能描述:IC MCU 32BIT 1MB FLASH 64QFN

EFM32-GG230F1024-SK 制造商:Energy Micro AS 功能描述:GIANT GECKO SAMPLE KIT - Bulk

EFM32GG230F1024-T 制造商:Energy Micro AS 功能描述:IC MCU 32BIT 1MB FLASH 64QFN

EFM32GG230F512 功能描述:ARM微控制器 - MCU 512KB FL 128KB RAM RoHS:否制造商:STMicroelectronics 核心:ARM Cortex M4F 处理器系列:STM32F373xx 数据总线宽度:32 bit 最大时钟频率:72 MHz 程序存储器大小:256 KB 数据 RAM 大小:32 KB 片上 ADC:Yes 工作电源电压:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:LQFP-48 安装风格:SMD/SMT