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ST20C2 数据表(PDF) 205 Page - STMicroelectronics |
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ST20C2 数据表(HTML) 205 Page - STMicroelectronics |
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205 / 212 page  xword 205/212 ® xword extend to word Code: 23 FA Description: Sign extend an N-bit signed number in Breg into a full word. To indicate the value of N, bit N-1 of Areg is set to 1; all other bits must be 0. Definition: if (Areg is a not power of 2) Areg ′← undefined else if (Areg = MostNeg) – N is BitsPerWord Areg ′← Breg else if (Breg ≥ 0) and (Breg < Areg) – Breg N bits and positive Areg ′← Breg else if (Breg ≥ Areg) and ((Breg >> 1) < Areg) – Breg N bits and negative Areg ′← Breg − (Areg << 1) else – Breg more than N bits Areg ′← undefined Breg ′← Creg Creg ′← undefined Error signals: none Comments: Secondary instruction. See also: xbword xsword |
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