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ST20C2 データシート(PDF) 102 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) 102 Page - STMicroelectronics

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ldiff
®
102/212
ldiff
long diff
Code: 24 FF
Description: Subtract unsigned numbers with borrow in. Subtract Areg from Breg
minus borrow in from Creg, producing difference in Areg and borrow out in Breg,
without checking for overflow.
Definition:
if (diff
≥ 0)
{
Areg
′
unsigned
← diff
Breg
′← 0
}
else
{
Areg
′
unsigned
← diff + 2BitsPerWord
Breg
′← 1
}
Creg
′← undefined
where diff
= Breg
unsigned − Aregunsigned − Creg0
– the value of diff is calculated to unlimited precision
Error signals: none
Comments:
Secondar y instruction.
See also:
lsub



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