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PM0214 Datasheet(PDF) 106 Page - STMicroelectronics

Part # PM0214
Description  This programming manual provides information
PDF  245 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM0214 Datasheet(HTML) 106 Page - STMicroelectronics

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The STM32 Cortex-M4 instruction set
PM0214
106/245
DocID022708 Rev 4
3.5.23
USADA8
Unsigned sum of absolute differences and accumulate
Syntax
USADA8{cond}{Rd,} Rn, Rm, Ra
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
•
‘Ra’ is the register that contains the accumulation value.
Operation
The USADA8 instruction:
1.
Subtracts each byte of the second operand register from the corresponding byte of the
first operand register.
2.
Adds the unsigned absolute differences together.
3.
Adds the accumulation value to the sum of the absolute differences.
4.
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
USADA8 R1, R0, R6
; Subtracts bytes in R0 from corresponding halfword of R1
; adds differences, adds value of R6, writes to R1
USADA8
R4, R0, R5, R2 ; Subtracts bytes of R5 from corresponding byte in R0
; adds differences, adds value of R2 writes to R4.



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