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ST20C2 датащи(PDF) 152 Page - STMicroelectronics

номер детали ST20C2
подробное описание детали  Instruction Set Reference Manual
PDF  212 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST20C2 датащи(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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