参数资料
型号: EFM32G222F128
厂商: Energy Micro
文件页数: 77/136页
文件大小: 0K
描述: IC MCU 32BIT 128KB FLASH 48LQFP
特色产品: EFM32 Gecko
标准包装: 1
系列: Gecko
核心处理器: ARM? Cortex?-M3
芯体尺寸: 32-位
速度: 32MHz
连通性: 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: 37
程序存储器容量: 128KB(128K x 8)
程序存储器类型: 闪存
RAM 容量: 16K 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: 48-TQFP
包装: 标准包装
其它名称: 914-1027-6
...the world's most energy friendly microcontrollers
2011-02-04 - d0002_Rev1.00
45
www.energymicro.com
Example 3.2 (p. 45) shows the use of conditional instructions to update the value of R4 if the signed
values R0 is greater than R1 and R2 is greater than R3.
Example 3.2. Compare and update value
CMP
R0, R1
; Compare R0 and R1, setting flags
ITT
GT
; IT instruction for the two GT conditions
CMPGT
R2, R3
; If 'greater than', compare R2 and R3, setting flags
MOVGT
R4, R5
; If still 'greater than', do R4 = R5
3.3.8 Instruction width selection
There are many instructions that can generate either a 16-bit encoding or a 32-bit encoding depending on
the operands and destination register specified. For some of these instructions, you can force a specific
instruction size by using an instruction width suffix. The .W suffix forces a 32-bit instruction encoding.
The .N suffix forces a 16-bit instruction encoding.
If you specify an instruction width suffix and the assembler cannot generate an instruction encoding of
the requested width, it generates an error.
Note
In some cases it might be necessary to specify the .W suffix, for example if the operand
is the label of an instruction or literal data, as in the case of branch instructions. This is
because the assembler might not automatically generate the right size encoding.
To use an instruction width suffix, place it immediately after the instruction mnemonic and condition
code, if any. Example 3.3 (p. 45) shows instructions with the instruction width suffix.
Example 3.3. Instruction width selection
BCS.W
label
; creates a 32-bit instruction even for a short branch
ADDS.W R0, R0, R1 ; creates a 32-bit instruction even though the same
; operation can be done by a 16-bit instruction
3.4 Memory access instructions
Table 3.5 (p. 45) shows the memory access instructions:
Table 3.5. Memory access instructions
Mnemonic
Brief description
See
ADR
Load PC-relative address
CLREX
Clear Exclusive
LDM{mode}
Load Multiple registers
LDR{type}
Load Register using immediate offset
LDR{type}
Load Register using register offset
LDR{type}T
Load Register with unprivileged access
LDR
Load Register using PC-relative address
LDREX{type}
Load Register Exclusive
POP
Pop registers from stack
PUSH
Push registers onto stack
STM{mode}
Store Multiple registers
STR{type}
Store Register using immediate offset
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EFM32G222F128G-E-QFP48R 功能描述:128K FLASH, 16K RAM, AES 制造商:silicon labs 系列:Gecko 包装:剪切带(CT) 零件状态:在售 核心处理器:ARM? Cortex?-M3 核心尺寸:32-位 速度:32MHz 连接性:I2C,IrDA,智能卡,SPI,UART/USART 外设:欠压检测/复位,DMA,POR,PWM,WDT I/O 数:37 程序存储容量:128KB(128K x 8) 程序存储器类型:闪存 EEPROM 容量:- RAM 容量:16K x 8 电压 - 电源(Vcc/Vdd):1.98 V ~ 3.8 V 数据转换器:A/D 4x12b,D/A 1x12b 振荡器类型:内部 工作温度:-40°C ~ 85°C(TA) 封装/外壳:48-TQFP 供应商器件封装:48-TQFP(7x7) 标准包装:1
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