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ST20CX Fiches technique(PDF) 102 Page - STMicroelectronics |
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ST20CX Fiches technique(HTML) 102 Page - STMicroelectronics |
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102 / 212 page ![]() 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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