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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST20C2 датащи(PDF) 134 Page - STMicroelectronics |
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ST20C2 датащи(HTML) 134 Page - STMicroelectronics |
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134 / 212 page  norm ® 134/212 norm normalize Code: 21 F9 Description: Normalize the unsigned double length number stored in Breg and Areg (most significant word in Breg). The value is shifted left until the most significant bit is a one. The number of places shifted is returned in Creg. This instruction is used as the first instr uction in the single length floating point rounding code sequence , norm; postnormsn; roundsn. Definition: if ((Bregunsigned = 0) and (Aregunsigned = 0)) Creg ′← 2 × BitsPerWord else { Creg ′← number of most significant zero bits in long Areg ′ unsigned ← (long << Creg′) rem 2BitsPerWord Breg ′ unsigned ← ((long << Creg′) / 2BitsPerWord) rem 2BitsPerWord } where long = (Breg unsigned × 2 BitsPerWord) + Areg unsigned – the value of long is calculated to double word precision Error signals: none Comments: Secondar y instruction. See also: lshl lshr postnormsn roundsn shl shr |
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