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ST20C2 数据表(PDF) 104 Page - STMicroelectronics |
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ST20C2 数据表(HTML) 104 Page - STMicroelectronics |
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104 / 212 page  ldiv ® 104/212 ldiv long divide Code: 21 FA Description: Divide the double length unsigned integer in Breg and Creg (most significant word in Creg) by an unsigned integer in Areg. The quotient is put into Areg and the remainder into Breg. Overflow occurs if either the quotient is not representable in a single word, or if a division by zero is attempted; the condition for overflow is equivalent to Cregunsigned ≥ Aregunsigned. Definition: if (Cregunsigned ≥ Aregunsigned) IntegerOverflow else { Areg ′ unsigned ← long / Areg unsigned Breg ′ unsigned ← long rem Areg unsigned } Creg ′← undefined where long = (Creg unsigned × 2 BitsPerWord) + Breg unsigned – the value of long is calculated to unlimited precision Error signals: IntegerOverflow can occur. Comments: Secondar y instruction. See also: lmul |
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