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ST20C4 Datasheet(PDF) 124 Page - STMicroelectronics

No. de pieza ST20C4
Descripción Electrónicos  Instruction Set Reference Manual
PDF  212 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST20C4 Datasheet(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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