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ST20C2 Datasheet(PDF) 123 Page - STMicroelectronics |
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ST20C2 Datasheet(HTML) 123 Page - STMicroelectronics |
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123 / 212 page  lsub 123/212 ® lsub long subtract Code: 23 F8 Description: Subtract with borrow in and check for overflow. The result of the operation, put into Areg,is Breg minus Areg, minus bit 0 of Creg. Definition: if (diff > MostPos) { Areg ′← diff − 2BitsPerWord IntegerOverflow } else if (diff < MostNeg) { Areg ′← diff + 2BitsPerWord IntegerOverflow } else Areg ′← diff Breg ′← undefined Creg ′← undefined where diff = (Breg − Areg) − Creg 0 – the value of diff is calculated to unlimited precision Error signals: IntegerOverflow can be signalled. Comments: Secondary instruction. See also: ldiff |
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