參數資料
型號： EFM32TG110F32
廠商： Energy Micro
文件頁數： 26/136頁
文件大?。?/td> 0K
描述： MCU 32BIT 32KB FLASH 24-QFN
特色產品： EFM32 Tiny Gecko
標準包裝： 1
系列： Tiny Gecko
核心處理器： ARM? Cortex?-M3
芯體尺寸： 32-位
速度： 32MHz
連通性： EBI/EMI，I²C，IrDA，智能卡，SPI，UART/USART
外圍設備： 欠壓檢測/復位，DMA，POR，PWM，WDT
輸入/輸出數： 17
程序存儲器容量： 32KB（32K x 8）
程序存儲器類型： 閃存
RAM 容量： 4K x 8
電壓 - 電源 (Vcc/Vdd)： 1.8 V ~ 3.8 V
數據轉換器： A/D 2x12b，D/A 1x12b
振蕩器型： 外部
工作溫度： -40°C ~ 85°C
封裝/外殼： 24-VQFN 裸露焊盤
包裝： 標準包裝
其它名稱： 914-1033-6
...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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