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PM0223 bảng dữ liệu(PDF) 63 Page - STMicroelectronics

tên linh kiện PM0223
Giải thích chi tiết về linh kiện  This programming manual provides information for application and system-level software developers
PDF  110 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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PM0223 bảng dữ liệu(HTML) 63 Page - STMicroelectronics

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PM0223
The STM32L0 Cortex-M0+ Instruction Set
80
3.5.8
SXT and UXT
Sign extend and Zero extend.
Syntax
SXTB Rd, Rm
SXTH Rd, Rm
UXTB Rd, Rm
UXTH Rd, Rm
where:
Operation
•
These instructions 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.
Restrictions
In these instructions, Rd and Rm must only specify R0-R7.
Condition flags
These instructions do not affect the flags.
Examples
SXTH
R4, R6
; Obtain the lower halfword of the
; value in R6 and then sign extend to
; 32 bits and write the result to R4.
UXTB
R3, R1
; Extract lowest byte of the value in R10 and zero
; extend it, and write the result to R3
Rd
Is the destination register.
Rm
Is the register holding the value to be extended.



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