参数资料
型号: EFM32-TG-STK3300
厂商: Energy Micro
文件页数: 108/136页
文件大小: 0K
描述: KIT STARTER EFM32 GECKO
特色产品: EFM32 Tiny Gecko
标准包装: 1
系列: EFM®32
类型: MCU
适用于相关产品: EFM32-TGXXX
所含物品: 板,线缆,CD 和文档
其它名称: 914-1018
...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
相关PDF资料
PDF描述
HSC08DRYH-S13 CONN EDGECARD 16POS .100 EXTEND
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