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ST20C2 Datasheet(PDF) 153 Page - STMicroelectronics

Part # ST20C2
Description  Instruction Set Reference Manual
PDF  212 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST20C2 Datasheet(HTML) 153 Page - STMicroelectronics

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satsub
153/212
®
satsub
saturating subtract
Code: 26 F9
Description: Perform subtraction 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 (diff
> MostPos)
Areg
′← MostPos
else if (diff
< MostNeg)
Areg
′← MostNeg
else
Areg
′← diff
Breg
′← Creg
Creg
′← undefined
where diff
= Breg − Areg
– diff
is calculated to unlimited precision
Error signals: none
Comments:
Secondary instruction.
See also:
satadd satmul



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