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ST20C2 Datasheet(PDF) 96 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) 96 Page - STMicroelectronics

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ladd
®
96/212
ladd
long add
Code: 21 F6
Description: Add with carry in and check for overflow. The result of the operation is
the sum of Areg, Breg and bit 0 of Creg.
Definition:
if (sum
> MostPos)
{
Areg
′← sum − 2BitsPerWord
IntegerOverflow
}
else if (sum
< MostNeg)
{
Areg
′← sum + 2BitsPerWord
IntegerOverflow
}
else
Areg
′← sum
Breg
′← undefined
Creg
′← undefined
where
sum
= Areg + Breg + Creg
0
– the value of sum is calculated to unlimited precision
Error signals:
IntegerOverflow can be signalled.
Comments:
Secondar y instruction.
See also:
lsum



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