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ST20C2 Fiches technique(PDF) 151 Page - STMicroelectronics

No de pièce ST20C2
Description  Instruction Set Reference Manual
PDF  212 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST20C2 Fiches technique(HTML) 151 Page - STMicroelectronics

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satadd
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®
satadd
saturating add
Code: 26 F8
Description: Perform addition 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 (sum
> MostPos)
Areg
′← MostPos
else if (sum
< MostNeg)
Areg
′← MostNeg
else
Areg
′← sum
Breg
′← Creg
Creg
′← undefined
where sum
= Breg + Areg
– sum
is calculated to unlimited precision
Error signals: none
Comments:
Secondary instruction.
See also:
satsub satmul



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