ST20C2 datasheet(152/212 Pages) STMICROELECTRONICS

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ST20C2 Folha de dados(PDF) 152 Page - STMicroelectronics

Nome de Peças	ST20C2

Descrição Electrónicos	Instruction Set Reference Manual

PDF	212 Pages

Scroll/Zoom	100%

Fabricante Electrônico	STMICROELECTRONICS [STMicroelectronics]

Página de início	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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