參數(shù)資料
型號： EFM32TG822F32
廠商： Energy Micro
文件頁數(shù)： 25/136頁
文件大?。?/td> 0K
描述： IC MCU 32BIT 32KB FLASH 48LQFP
特色產(chǎn)品： EFM32 Tiny Gecko
標(biāo)準(zhǔn)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： I²C，IrDA，智能卡，SPI，UART/USART
外圍設(shè)備： 欠壓檢測/復(fù)位，DMA，I²S，LCD，POR，PWM，WDT
輸入/輸出數(shù)： 37
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(shù)據(jù)轉(zhuǎn)換器： A/D 4x12b，D/A 1x12b
振蕩器型： 外部
工作溫度： -40°C ~ 85°C
封裝/外殼： 48-TQFP
包裝： 標(biāo)準(zhǔn)包裝
其它名稱： 914-1031-6
...the world's most energy friendly microcontrollers
2011-02-04 - d0002_Rev1.00
120
www.energymicro.com
Table 4.47 (p. 120) shows the AP encodings that define the access permissions for privileged and
unprivileged software.
Table 4.47. AP encoding
AP[2:0]
Privileged
permissions
Unprivileged
permissions
Description
000
No access
All accesses generate a permission fault
001
RW
No access
Access from privileged software only
010
RW
RO
Writes by unprivileged software generate a permission fault
011
RW
Full access
100
Unpredictable
Reserved
101
RO
No access
Reads by privileged software only
110
RO
Read only, by privileged or unprivileged software
111
RO
Read only, by privileged or unprivileged software
4.5.7 MPU mismatch
When an access violates the MPU permissions, the processor generates a memory management fault,
see Section 2.1.4 (p. 13) . The MMFSR indicates the cause of the fault. See Section 4.3.11.1 (p. 105)
for more information.
4.5.8 Updating an MPU region
To update the attributes for an MPU region, update the RNR, RBAR and RASR registers. You can
program each register separately, or use a multiple-word write to program all of these registers. You can
use the RBAR and RASR aliases to program up to four regions simultaneously using an STM instruction.
4.5.8.1 Updating an MPU region using separate words
Simple code to configure one region:
; 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
STR R4, [R0, #0x4]
; Region Base Address
STRH R2, [R0, #0x8]
; Region Size and Enable
STRH R3, [R0, #0xA]
; Region Attribute
Disable a region before writing new region settings to the MPU if you have previously enabled the region
being changed. For example:
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