参数资料
型号: EFM32TG210F32
厂商: Energy Micro
文件页数: 26/136页
文件大小: 0K
描述: MCU 32BIT 32KB FLASH 32-QFN
特色产品: EFM32 Tiny Gecko
标准包装: 1
系列: Tiny Gecko
核心处理器: ARM? Cortex?-M3
芯体尺寸: 32-位
速度: 32MHz
连通性: EBI/EMI,I²C,IrDA,智能卡,SPI,UART/USART
外围设备: 欠压检测/复位,DMA,POR,PWM,WDT
输入/输出数: 24
程序存储器容量: 32KB(32K x 8)
程序存储器类型: 闪存
RAM 容量: 4K x 8
电压 - 电源 (Vcc/Vdd): 1.8 V ~ 3.8 V
数据转换器: A/D 4x12b,D/A 1x12b
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 32-VQFN 裸露焊盘
包装: 标准包装
其它名称: 914-1034-6
...the world's most energy friendly microcontrollers
2011-02-04 - d0002_Rev1.00
121
www.energymicro.com
; R1 = region number
; R2 = size/enable
; R3 = attributes
; R4 = address
LDR R0,=MPU_RNR
; 0xE000ED98, MPU region number register
STR R1, [R0, #0x0]
; Region Number
BIC R2, R2, #1
; Disable
STRH R2, [R0, #0x8]
; Region Size and Enable
STR R4, [R0, #0x4]
; Region Base Address
STRH R3, [R0, #0xA]
; Region Attribute
ORR R2, #1
; Enable
STRH R2, [R0, #0x8]
; Region Size and Enable
Software must use memory barrier instructions:
before MPU setup if there might be outstanding memory transfers, such as buffered writes, that might
be affected by the change in MPU settings
after MPU setup if it includes memory transfers that must use the new MPU settings.
However, memory barrier instructions are not required if the MPU setup process starts by entering an
exception handler, or is followed by an exception return, because the exception entry and exception
return mechanism cause memory barrier behavior.
Software does not need any memory barrier instructions during MPU setup, because it accesses the
MPU through the PPB, which is a Strongly-Ordered memory region.
For example, if you want all of the memory access behavior to take effect immediately after the
programming sequence, use a DSB instruction and an ISB instruction. A DSB is required after changing
MPU settings, such as at the end of context switch. An ISB is required if the code that programs the
MPU region or regions is entered using a branch or call. If the programming sequence is entered using
a return from exception, or by taking an exception, then you do not require an ISB.
4.5.8.2 Updating an MPU region using multi-word writes
You can program directly using multi-word writes, depending on how the information is divided. Consider
the following reprogramming:
; R1 = region number
; R2 = address
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