參數(shù)資料
型號: EFM32TG210F32
廠商: Energy Micro
文件頁數(shù): 106/136頁
文件大小: 0K
描述: MCU 32BIT 32KB FLASH 32-QFN
特色產(chǎn)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(shù): 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(shù)據(jù)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
71
www.energymicro.com
; saturate it as a signed 16-bit value and
; write it back to R7
USATNE
R0, #7, R5
; Conditionally saturate value in R5 as an
; unsigned 7 bit value and write it to R0
3.8 Bitfield instructions
Table 3.10 (p. 71) shows the instructions that operate on adjacent sets of bits in registers or bitfields:
Table 3.10. Packing and unpacking instructions
Mnemonic
Brief description
See
BFC
Bit Field Clear
BFI
Bit Field Insert
SBFX
Signed Bit Field Extract
SXTB
Sign extend a byte
SXTH
Sign extend a halfword
UBFX
Unsigned Bit Field Extract
UXTB
Zero extend a byte
UXTH
Zero extend a halfword
3.8.1 BFC and BFI
Bit Field Clear and Bit Field Insert.
3.8.1.1 Syntax
BFC{cond} Rd, #lsb, #width
BFI{cond} Rd, Rn, #lsb, #width
where:
cond
is an optional condition code, see Section 3.3.7 (p. 43) .
Rd
is the destination register.
Rn
is the source register.
lsb
is the position of the least significant bit of the bitfield. lsb must be in the range 0 to 31.
width
is the width of the bitfield and must be in the range 1 to 32#lsb.
3.8.1.2 Operation
BFC
clears a bitfield in a register. It clears width bits in Rd, starting at the low bit position lsb. Other
bits in Rd are unchanged.
BFI
copies a bitfield into one register from another register. It replaces width bits in Rd starting at the
low bit position lsb, with width bits from Rn starting at bit[0]. Other bits in Rd are unchanged.
3.8.1.3 Restrictions
Do not use SP and do not use PC.
3.8.1.4 Condition flags
These instructions do not affect the flags.
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