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ST20C4 데이터시트(PDF) 121 Page - STMicroelectronics |
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ST20C4 데이터시트(HTML) 121 Page - STMicroelectronics |
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121 / 212 page ![]() lshl 121/212 ® lshl long shift left Code: 23 F6 Description: Logical shift left the double word value in Creg and Breg (most significant w ord in Creg) by the number of places specified in Areg. Only defined if the shift length is less than twice the wordlength. Definition: if (0 ≤ Areg < 2 × BitsPerWord) { Areg ′← (long << Areg unsigned) rem 2 BitsPerWord Breg ′← ((long << Areg unsigned) / 2 BitsPerWord) rem 2BitsPerWord } else { Areg ′← undefined Breg ′← undefined } Creg ′← undefined where long = (Creg unsigned × 2 BitsPerWord) + Breg unsigned – the value of long is calculated to double word precision Error signals: none Comments: Secondary instruction. The behavior for shift lengths outside the stated range is implementation dependent. See also: lshr norm |
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