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ST20C4 Datenblatt(PDF) 152 Page - STMicroelectronics

Teilenummer ST20C4
Bauteilbeschribung  Instruction Set Reference Manual
PDF  212 Pages
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST20C4 Datenblatt(HTML) 152 Page - STMicroelectronics

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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.
See also:
satadd satsub



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