ST20C4 datasheet(152/212 Pages) STMICROELECTRONICS

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ST20C4 데이터시트(PDF) 152 Page - STMicroelectronics

부품명	ST20C4

상세설명	Instruction Set Reference Manual

PDF	212 Pages

Scroll/Zoom	100%

제조업체	STMICROELECTRONICS [STMicroelectronics]

홈페이지	http://www.st.com

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152 / 212 page

satmul

152/212

satmul

saturating multiply

Code: 26 FA

Description: Perform multiplication using ‘saturating arithmetic’ i.e. signed arithmetic

where overflowing results do not wrap round but return MostPos or MostNeg

according to the sign of the result. This instruction is used for clipping algorithms in

signal processing.

Definition:

if (prod

> MostPos)

Areg

′← MostPos

else if (prod

< MostNeg)

Areg

′← MostNeg

else

Areg

′← prod

Breg

′← Creg

Creg

′← undefined

where prod

= Breg × Areg

– prod

is calculated to unlimited precision

Error signals: none

Comments:

Secondar y instruction.

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