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參數資料
型號： EFM32-TG840F32-SK
廠商： Energy Micro
文件頁數： 105/136頁
文件大小： 0K
描述： IC MICRO KIT GECKO 64QFN
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： 64-QFN
工具箱內容： (2) 914-1036-2-ND - MCU 32BIT 32KB FLASH 64-QFN
其它名稱： 914-1020
...the world's most energy friendly microcontrollers
2011-02-04 - d0002_Rev1.00
70
www.energymicro.com
where:
op
is one of:
SSAT
Saturates a signed value to a signed range.
USAT
Saturates a signed value to an unsigned range.
cond
is an optional condition code, see Section 3.3.7 (p. 43) .
Rd
is the destination register.
n
specifies the bit position to saturate to:
n ranges from 1 to 32 for SSAT
n ranges from 0 to 31 for USAT.
Rm
is the register containing the value to saturate.
shift#s
is an optional shift applied to Rm before saturating. It must be one of
the following:
ASR #s
where s is in the range 1 to 31
LSL #s
where s is in the range 0 to 31.
3.7.1.2 Operation
These instructions saturate to a signed or unsigned n-bit value.
The SSAT instruction applies the specified shift, then saturates to the signed range #2
n
–1 # x # 2n–1#1.
The USAT instruction applies the specified shift, then saturates to the unsigned range 0 # x # 2
n#1.
For signed n-bit saturation using SSAT, this means that:
if the value to be saturated is less than #2
n#1, the result returned is #2n-1
if the value to be saturated is greater than 2
n#1#1, the result returned is 2n-1#1
otherwise, the result returned is the same as the value to be saturated.
For unsigned n-bit saturation using USAT, this means that:
if the value to be saturated is less than 0, the result returned is 0
if the value to be saturated is greater than 2
n#1, the result returned is 2n#1
otherwise, the result returned is the same as the value to be saturated.
If the returned result is different from the value to be saturated, it is called saturation. If saturation occurs,
the instruction sets the Q flag to 1 in the APSR. Otherwise, it leaves the Q flag unchanged. To clear the
Q flag to 0, you must use the MSR instruction, see Section 3.10.7 (p. 83) .
To read the state of the Q flag, use the MRS instruction, see Section 3.10.6 (p. 83) .
3.7.1.3 Restrictions
Do not use SP and do not use PC.
3.7.1.4 Condition flags
These instructions do not affect the condition code flags.
If saturation occurs, these instructions set the Q flag to 1.
3.7.1.5 Examples
SSAT
R7, #16, R7, LSL #4
; Logical shift left value in R7 by 4, then
相關PDF資料
PDF描述
EFM32-TG822F32-SK IC MICRO KIT GECKO 48LQFP
EFM32-TG222F32-SK IC MICRO KIT GECKO 48LQFP
EFM32-TG230F32-SK IC MICRO KIT GECKO 64QFN
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1267 X 6" TAPE ALUMINUM FOIL 6" X 1FT
相關代理商/技術參數
參數描述
EFM32TG840F32-T 制造商:Energy Micro AS 功能描述:IC MCU 32BIT 32KB FLASH 64QFN
EFM32TG840F8 功能描述:ARM微控制器 - MCU 8KB Flash 2KB 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
EFM32TG840F8-QFN64 制造商:Energy Micro AS 功能描述:8 FLASH, USART + UART 2, QFN64 - Tape and Reel 制造商:Energy Micro AS 功能描述:IC MCU 32BIT 8KB FLASH 64QFN
EFM32TG840F8-QFN64T 制造商:Energy Micro AS 功能描述:32 BIT ARM MPU, TINY GECKO - Trays
EFM32TG840F8-QFN64-T 制造商:Energy Micro AS 功能描述:IC MCU 32BIT 8KB FLASH 64QFN
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