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ST20C4 Datenblatt(PDF) 124 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) 124 Page - STMicroelectronics

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lsum
®
124/212
lsum
long sum
Code: 23 F7
Description: Add unsigned numbers with carry in and carry out. Add Breg to Areg
(treated as unsigned numbers) plus carry in from Creg, producing the sum in Areg
and carry out in Breg, without checking for overflow.
Definition:
if (sum
> MostPosUnsigned)
{
Areg
unsigned
← sum − 2BitsPerWord
Breg
′← 1
}
else
{
Areg
unsigned
← sum
Breg
′← 0
}
Creg
′← undefined
where sum
= Areg
unsigned + Bregunsigned + Creg0
the value of sum is calculated to unlimited precision
Error signals: none
Comments:
Secondar y instruction.
See also:
ladd



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