參數資料
型號: EFM32TG210F32
廠商: Energy Micro
文件頁數: 80/136頁
文件大?。?/td> 0K
描述: MCU 32BIT 32KB FLASH 32-QFN
特色產品: EFM32 Tiny Gecko
標準包裝: 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: EBI/EMI,I²C,IrDA,智能卡,SPI,UART/USART
外圍設備: 欠壓檢測/復位,DMA,POR,PWM,WDT
輸入/輸出數: 24
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
數據轉換器: A/D 4x12b,D/A 1x12b
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 32-VQFN 裸露焊盤
包裝: 標準包裝
其它名稱: 914-1034-6
...the world's most energy friendly microcontrollers
2011-02-04 - d0002_Rev1.00
48
www.energymicro.com
The value to load or store can be a byte, halfword, word, or two words. Bytes and halfwords can either
be signed or unsigned. See Section 3.3.5 (p. 42) .
Table 3.6 (p. 48) shows the ranges of offset for immediate, pre-indexed and post-indexed forms.
Table 3.6. Offset ranges
Instruction type
Immediate offset
Pre-indexed
Post-indexed
Word, halfword, signed
halfword, byte, or signed byte
#255 to 4095
#255 to 255
Two words
multiple of 4 in the
range #1020 to 1020
multiple of 4 in the
range #1020 to 1020
multiple of 4 in the
range #1020 to 1020
3.4.2.3 Restrictions
For load instructions:
Rt can be SP or PC for word loads only
Rt must be different from Rt2 for two-word loads
Rn must be different from Rt and Rt2 in the pre-indexed or post-indexed forms.
When Rt is PC in a word load instruction:
bit[0] of the loaded value must be 1 for correct execution
a branch occurs to the address created by changing bit[0] of the loaded value to 0
if the instruction is conditional, it must be the last instruction in the IT block.
For store instructions:
Rt can be SP for word stores only
Rt must not be PC
Rn must not be PC
Rn must be different from Rt and Rt2 in the pre-indexed or post-indexed forms.
3.4.2.4 Condition flags
These instructions do not change the flags.
3.4.2.5 Examples
LDR
R8, [R10]
; Loads R8 from the address in R10.
LDRNE
R2, [R5, #960]!
; Loads (conditionally) R2 from a word
; 960 bytes above the address in R5, and
; increments R5 by 960.
STR
R2, [R9,#const#struc]
; const#struc is an expression evaluating
; to a constant in the range 0#4095.
STRH
R3, [R4], #4
; Store R3 as halfword data into address in
; R4, then increment R4 by 4
LDRD
R8, R9, [R3, #0x20]
; Load R8 from a word 32 bytes above the
; address in R3, and load R9 from a word 36
; bytes above the address in R3
STRD
R0, R1, [R8], #-16
; Store R0 to address in R8, and store R1 to
; a word 4 bytes above the address in R8,
; and then decrement R8 by 16.
3.4.3 LDR and STR, register offset
Load and Store with register offset.
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