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ST20C2 数据表(PDF) 181 Page - STMicroelectronics |
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ST20C2 数据表(HTML) 181 Page - STMicroelectronics |
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181 / 212 page  sulmul 181/212 ® sulmul signed times unsigned long multiply Code: 26 F5 Description: Perform signed long multiplication. This instruction forms the double length product of Areg and Breg, with Creg as carry in, treating the initial value Areg as signed and Breg as unsigned. Definition: Areg ′ unsigned ← prod rem 2BitsPerWord Breg ′← prod / 2BitsPerWord Creg ′← undefined where prod = (Breg unsigned × Areg) + Cregunsigned – the value of prod is calculated to unlimited precision Error signals: none Comments: Secondary instruction. See also: lmul slmul |
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