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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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PM0214 데이터시트(PDF) 106 Page - STMicroelectronics |
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PM0214 데이터시트(HTML) 106 Page - STMicroelectronics |
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106 / 245 page  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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