The STM32 Cortex-M4 instruction set PM0214
106/262 PM0214 Rev 10
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 65).
• ‘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 either SP or 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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