参数资料
型号: EFM32TG230F32
厂商: Energy Micro
文件页数: 22/136页
文件大小: 0K
描述: MCU 32BIT 32KB FLASH 64-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: 56
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 8x12b,D/A 2x12b
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 64-VFQFN 裸露焊盘
包装: 标准包装
其它名称: 914-1035-6
...the world's most energy friendly microcontrollers
2011-02-04 - d0002_Rev1.00
118
www.energymicro.com
RASR is accessible using word or halfword accesses:
the most significant halfword holds the region attributes
the least significant halfword holds the region size and the region and subregion enable bits.
The bit assignments are:
XN
Reserved
31
29 28 27 26
24 23 22 21
19 18 17 16 15
8 7 6 5
1 0
AP
TEX
S C B
SRD
SIZE
ENABLE
Reserved
Table 4.43. RASR bit assignments
Bits
Name
Function
[31:29]
-
Reserved.
[28]
XN
Instruction access disable bit:
0 = instruction fetches enabled1 = instruction fetches disabled.
[27]
-
Reserved.
[26:24]
AP
Access permission field, see Table 4.47 (p. 120) .
[23:22]
-
Reserved.
[21:19, 17, 16]
TEX, C, B
Memory access attributes, see Table 4.45 (p. 119) .
[18]
S
Shareable bit, see Table 4.45 (p. 119) .
[15:8]
SRD
Subregion disable bits. For each bit in this field:
0 = corresponding sub-region is enabled
1 = corresponding sub-region is disabled
See Section 4.5.8.3 (p. 122) for more information.
Region sizes of 128 bytes and less do not support subregions. When writing the attributes
for such a region, write the SRD field as 0x00.
[7:6]
-
Reserved.
[5:1]
SIZE
Specifies the size of the MPU protection region. The minimum permitted value is 3
(b00010), see See Section 4.5.5.1 (p. 118) for more information.
[0]
ENABLE
Region enable bit.
For information about access permission, see Section 4.5.6 (p. 119) .
4.5.5.1 SIZE field values
The SIZE field defines the size of the MPU memory region specified by the RNR. as follows:
(Region size in bytes) = 2
(SIZE+1)
The smallest permitted region size is 32B, corresponding to a SIZE value of 4. Table 4.44 (p. 118)
gives example SIZE values, with the corresponding region size and value of N in the RBAR.
Table 4.44. Example SIZE field values
SIZE value
Region size
Value of N
1
Note
b00100 (4)
32B
5
Minimum permitted size
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