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ST20C2 数据表(PDF) 122 Page - STMicroelectronics |
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ST20C2 数据表(HTML) 122 Page - STMicroelectronics |
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122 / 212 page  lshr ® 122/212 lshr long shift right Code: 23 F5 Description: Logical shift right the double word value in Creg and Breg (most significant word in Creg) by the number of places specified in Areg. This instruction is only defined if the shift length is less than twice the word length. 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: Secondar y instruction. The behavior for shift lengths outside the stated range is implementation dependent. See also: lshl |
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