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參數資料
型號: EFM32-TG110F32-SK
廠商: Energy Micro
文件頁數: 83/136頁
文件大?。?/td> 0K
描述: IC MICRO KIT GECKO 24QFN
標準包裝: 1
系列: Tiny Gecko
套件類型: 微控制器
值: 2 件 - 閃存 - 32KB
包裝: 紙板盒
安裝類型: 表面貼裝
包括封裝: 24-QFN
工具箱內容: (2) 914-1033-2-ND - MCU 32BIT 32KB FLASH 24-QFN
其它名稱: 914-1022
...the world's most energy friendly microcontrollers
2011-02-04 - d0002_Rev1.00
50
www.energymicro.com
LDRSB
R0, [R5, R1, LSL #1] ; Read byte value from an address equal to
; sum of R5 and two times R1, sign extended it
; to a word value and put it in R0
STR
R0, [R1, R2, LSL #2] ; Stores R0 to an address equal to sum of R1
; and four times R2
3.4.4 LDR and STR, unprivileged
Load and Store with unprivileged access.
3.4.4.1 Syntax
op{type}T{cond} Rt, [Rn {, #offset}]
; immediate offset
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.
offset
is an offset from Rn and can be 0 to 255. If offset is omitted, the address is the value in Rn.
3.4.4.2 Operation
These load and store instructions perform the same function as the memory access instructions with
immediate offset, see Section 3.4.2 (p. 46) . The difference is that these instructions have only
unprivileged access even when used in privileged software.
When used in unprivileged software, these instructions behave in exactly the same way as normal
memory access instructions with immediate offset.
3.4.4.3 Restrictions
In these instructions:
Rn must not be PC
Rt must not be SP and must not be PC.
3.4.4.4 Condition flags
These instructions do not change the flags.
3.4.4.5 Examples
STRBTEQ
R4, [R7]
; Conditionally store least significant byte in
; R4 to an address in R7, with unprivileged access
LDRHT
R2, [R2, #8]
; Load halfword value from an address equal to
; sum of R2 and 8 into R2, with unprivileged access
相關PDF資料
PDF描述
FAM1-400-400-2.0-1A FAM1 SHEET 400X400X2MM W/ADH
EFM32-TG108F32-SK IC MICRO KIT GECKO 24QFN
FAM1-400-400-1.5-1A FAM1 SHEET 400X400X1.5MM W/ADH
EFM32-G890F128-SK IC MICRO KIT GECKO 112BGA
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