参数资料
型号: EFM32TG210F32
厂商: Energy Micro
文件页数: 81/136页
文件大小: 0K
描述: MCU 32BIT 32KB FLASH 32-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: 24
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 4x12b,D/A 1x12b
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 32-VQFN 裸露焊盘
包装: 标准包装
其它名称: 914-1034-6
...the world's most energy friendly microcontrollers
2011-02-04 - d0002_Rev1.00
49
www.energymicro.com
3.4.3.1 Syntax
op{type}{cond} Rt, [Rn, Rm {, LSL #n}]
where:
op
is one of:
LDR
Load Register.
STR
Store Register.
type
is one of:
B
unsigned byte, zero extend to 32 bits on loads.
SB
signed byte, sign extend to 32 bits (LDR only).
H
unsigned halfword, zero extend to 32 bits on loads.
SH
signed halfword, sign extend to 32 bits (LDR only).
#
omit, for word.
cond
is an optional condition code, see Section 3.3.7 (p. 43) .
Rt
is the register to load or store.
Rn
is the register on which the memory address is based.
Rm
is a register containing a value to be used as the offset.
LSL #n
is an optional shift, with n in the range 0 to 3.
3.4.3.2 Operation
LDR
instructions load a register with a value from memory.
STR
instructions store a register value into memory.
The memory address to load from or store to is at an offset from the register Rn. The offset is specified
by the register Rm and can be shifted left by up to 3 bits using LSL.
The value to load or store can be a byte, halfword, or word. For load instructions, bytes and halfwords
can either be signed or unsigned. See Section 3.3.5 (p. 42) .
3.4.3.3 Restrictions
In these instructions:
Rn must not be PC
Rm must not be SP and must not be PC
Rt can be SP only for word loads and word stores
Rt can be PC only for word loads.
When Rt is PC in a word load instruction:
bit[0] of the loaded value must be 1 for correct execution, and a branch occurs to this halfword-aligned
address
if the instruction is conditional, it must be the last instruction in the IT block.
3.4.3.4 Condition flags
These instructions do not change the flags.
3.4.3.5 Examples
STR
R0, [R5, R1]
; Store value of R0 into an address equal to
; sum of R5 and R1
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