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參數資料
型號： EFM32-TG108F32-SK
廠商： Energy Micro
文件頁數： 88/136頁
文件大小： 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) 914-1032-2-ND - MCU 32BIT 32KB FLASH 24-QFN
其它名稱： 914-1025
...the world's most energy friendly microcontrollers
2011-02-04 - d0002_Rev1.00
55
www.energymicro.com
STREXH{cond} Rd, Rt, [Rn]
where:
cond
is an optional condition code, see Section 3.3.7 (p. 43) .
Rd
is the destination register for the returned status.
Rt
is the register to load or store.
Rn
is the register on which the memory address is based.
offset
is an optional offset applied to the value in Rn. If offset is omitted, the address is the value
in Rn.
3.4.8.2 Operation
LDREX
, LDREXB, and LDREXH load a word, byte, and halfword respectively from a memory address.
STREX
, STREXB, and STREXH attempt to store a word, byte, and halfword respectively to a memory
address. The address used in any Store-Exclusive instruction must be the same as the address in the
most recently executed Load-exclusive instruction. The value stored by the Store-Exclusive instruction
must also have the same data size as the value loaded by the preceding Load-exclusive instruction.
This means software must always use a Load-exclusive instruction and a matching Store-Exclusive
instruction to perform a synchronization operation, see Section 2.2.7 (p. 20)
If an Store-Exclusive instruction performs the store, it writes 0 to its destination register. If it does not
perform the store, it writes 1 to its destination register. If the Store-Exclusive instruction writes 0 to the
destination register, it is guaranteed that no other process in the system has accessed the memory
location between the Load-exclusive and Store-Exclusive instructions.
For reasons of performance, keep the number of instructions between corresponding Load-Exclusive
and Store-Exclusive instruction to a minimum.
Note
The result of executing a Store-Exclusive instruction to an address that is different from that
used in the preceding Load-Exclusive instruction is unpredictable.
3.4.8.3 Restrictions
In these instructions:
do not use PC
do not use SP for Rd and Rt
for STREX, Rd must be different from both Rt and Rn
the value of offset must be a multiple of four in the range 0-1020.
3.4.8.4 Condition flags
These instructions do not change the flags.
3.4.8.5 Examples
MOV
R1, #0x1
; Initialize the ‘lock taken’ value
try
LDREX
R0, [LockAddr]
; Load the lock value
CMP
R0, #0
; Is the lock free?
ITT
EQ
; IT instruction for STREXEQ and CMPEQ
STREXEQ R0, R1, [LockAddr]
; Try and claim the lock
CMPEQ
R0, #0
; Did this succeed?
BNE
try
; No – try again
....
; Yes – we have the lock
相關PDF資料
PDF描述
FAM1-400-400-1.5-1A FAM1 SHEET 400X400X1.5MM W/ADH
EFM32-G890F128-SK IC MICRO KIT GECKO 112BGA
176C TRANSFORMER AUTO STEP UP/PLG IN
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相關代理商/技術參數
參數描述
EFM32TG108F32-T 制造商:Energy Micro AS 功能描述:IC MCU 32BIT 32KB FLASH 24QFN
EFM32TG108F4 功能描述:ARM微控制器 - MCU 4KB Flash 1KB RAM RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 處理器系列:STM32F373xx 數據總線寬度:32 bit 最大時鐘頻率:72 MHz 程序存儲器大小:256 KB 數據 RAM 大小:32 KB 片上 ADC:Yes 工作電源電壓:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:LQFP-48 安裝風格:SMD/SMT
EFM32TG108F4-QFN24 制造商:Energy Micro AS 功能描述:TINY GECKO MCU - Tape and Reel 制造商:Energy Micro AS 功能描述:IC MCU 32BIT 4KB FLASH 24QFN
EFM32TG108F4-QFN24T 制造商:Energy Micro AS 功能描述:32 BIT ARM MPU, TINY GECKO - Trays
EFM32TG108F4-QFN24-T 制造商:Energy Micro AS 功能描述:IC MCU 32BIT 4KB FLASH 24QFN
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