PM0214 datasheet(106/245 Pages) 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:

Subtracts each byte of the second operand register from the corresponding byte of the

first operand register.

Adds the unsigned absolute differences together.

Adds the accumulation value to the sum of the absolute differences.

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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