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ST20C2 データシート(PDF) 124 Page - STMicroelectronics

部品番号 ST20C2
部品情報  Instruction Set Reference Manual
PDF  212 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST20C2 データシート(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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