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PM0214 bảng dữ liệu(PDF) 105 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  This programming manual provides information
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PM0214 bảng dữ liệu(HTML) 105 Page - STMicroelectronics

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PM0214
The STM32 Cortex-M4 instruction set
244
3.5.22
USAD8
Unsigned sum of absolute differences
Syntax
USAD8{cond}{Rd,} Rn, Rm
where:
•
‘cond’ is an optional condition code (see Conditional execution on page 64)
•
‘Rd’ is the destination register
•
‘Rn’ is the first operand register
•
‘Rm’ is the second operand register
Operation
The USAD8 instruction:
1.
Subtracts each byte of the second operand register from the corresponding byte of the
first operand register.
2.
Adds the absolute values of the differences together.
3.
Writes the result to the destination register.
Restrictions
Do not use SP and do not use PC.
Condition flags
These instructions do not change the flags.
Examples
USAD8 R1, R4, R0
; Subtracts each byte in R0 from corresponding byte of
; R4 adds the differences and writes to R1
USAD8
R0, R5
; Subtracts bytes of R5 from corresponding byte in R0,
; adds the differences and writes to R0.



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