參數(shù)資料
型號: EFM32G222F128
廠商: Energy Micro
文件頁數(shù): 48/136頁
文件大小: 0K
描述: IC MCU 32BIT 128KB FLASH 48LQFP
特色產(chǎn)品: EFM32 Gecko
標(biāo)準(zhǔn)包裝: 1
系列: 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,POR,PWM,WDT
輸入/輸出數(shù): 37
程序存儲器容量: 128KB(128K x 8)
程序存儲器類型: 閃存
RAM 容量: 16K 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: 914-1027-6
...the world's most energy friendly microcontrollers
2011-02-04 - d0002_Rev1.00
19
www.energymicro.com
bit_word_offset = (byte_offset x 32) + (bit_number x 4)
bit_word_addr = bit_band_base + bit_word_offset
where:
Bit_word_offset is the position of the target bit in the bit-band memory region.
Bit_word_addr is the address of the word in the alias memory region that maps to the targeted bit.
Bit_band_base is the starting address of the alias region.
Byte_offset is the number of the byte in the bit-band region that contains the targeted bit.
Bit_number is the bit position, 0-7, of the targeted bit.
Figure 2.1 (p. 19) shows examples of bit-band mapping between the SRAM bit-band alias region
and the SRAM bit-band region:
The alias word at 0x23FFFFE0 maps to bit[0] of the bit-band byte at 0x200FFFFF: 0x23FFFFE0 =
0x22000000
+ (0xFFFFF*32) + (0*4).
The alias word at 0x23FFFFFC maps to bit[7] of the bit-band byte at 0x200FFFFF: 0x23FFFFFC =
0x22000000
+ (0xFFFFF*32) + (7*4).
The alias word at 0x22000000 maps to bit[0] of the bit-band byte at 0x20000000: 0x22000000 =
0x22000000
+ (0*32) + (0 *4).
The alias word at 0x2200001C maps to bit[7] of the bit-band byte at 0x20000000: 0x2200001C =
0x22000000
+ (0*32) + (7*4).
Figure 2.1. Bit-band mapping
0x23FFFFE4
0x22000004
0x23FFFFE0
0x23FFFFE8
0x23FFFFEC
0x23FFFFF0
0x23FFFFF4
0x23FFFFF8
0x23FFFFFC
0x22000000
0x22000014
0x22000018
0x2200001C
0x22000008
0x22000010
0x2200000C
32MB alias region
0
7
0
7
0x20000000
0x20000001
0x20000002
0x20000003
6
5
4
3
2
1
0
7
6
5
4
3
2
1
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0x200FFFFC
0x200FFFFD
0x200FFFFE
0x200FFFFF
1MB SRAM bit -band region
2.2.5.1 Directly accessing an alias region
Writing to a word in the alias region updates a single bit in the bit-band region.
Bit[0] of the value written to a word in the alias region determines the value written to the targeted bit in
the bit-band region. Writing a value with bit[0] set to 1 writes a 1 to the bit-band bit, and writing a value
with bit[0] set to 0 writes a 0 to the bit-band bit.
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