參數(shù)資料
型號: EFM32G232F128
廠商: Energy Micro
文件頁數(shù): 108/136頁
文件大小: 0K
描述: IC MCU 32BIT 128KB FLASH 64LQFP
標準包裝: 1
系列: Gecko
核心處理器: ARM? Cortex?-M3
芯體尺寸: 32-位
速度: 32MHz
連通性: 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): 53
程序存儲器容量: 128KB(128K x 8)
程序存儲器類型: 閃存
RAM 容量: 16K x 8
電壓 - 電源 (Vcc/Vdd): 1.8 V ~ 3.8 V
數(shù)據(jù)轉換器: A/D 8x12b,D/A 1x12b
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 64-TQFP
包裝: 標準包裝
其它名稱: 914-1026-6
...the world's most energy friendly microcontrollers
2011-02-04 - d0002_Rev1.00
73
www.energymicro.com
UXTextend{cond} {Rd}, Rm {, ROR #n}
where:
extend
is one of:
B
Extends an 8#bit value to a 32#bit value.
H
Extends a 16#bit value to a 32#bit value.
cond
is an optional condition code, see Section 3.3.7 (p. 43) .
Rd
is the destination register.
Rm
is the register holding the value to extend.
ROR #n
is one of:
ROR #8
Value from Rm is rotated right 8 bits.
ROR #16
Value from Rm is rotated right 16 bits.
ROR #24
Value from Rm is rotated right 24 bits.
If ROR #n is omitted, no rotation is performed.
3.8.3.2 Operation
These instructions do the following:
1. Rotate the value from Rm right by 0, 8, 16 or 24 bits.
2. Extract bits from the resulting value:
SXTB extracts bits[7:0] and sign extends to 32 bits.
UXTB extracts bits[7:0] and zero extends to 32 bits.
SXTH extracts bits[15:0] and sign extends to 32 bits.
UXTH extracts bits[15:0] and zero extends to 32 bits.
3.8.3.3 Restrictions
Do not use SP and do not use PC.
3.8.3.4 Condition flags
These instructions do not affect the flags.
3.8.3.5 Examples
SXTH
R4, R6, ROR #16
; Rotate R6 right by 16 bits, then obtain the lower
; halfword of the result and then sign extend to
; 32 bits and write the result to R4.
UXTB
R3, R10
; Extract lowest byte of the value in R10 and zero
; extend it, and write the result to R3
3.9 Branch and control instructions
Table 3.11 (p. 73) shows the branch and control instructions:
Table 3.11. Branch and control instructions
Mnemonic
Brief description
See
B
Branch
BL
Branch with Link
BLX
Branch indirect with Link
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