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ST20CX bảng dữ liệu(PDF) 82 Page - STMicroelectronics

tên linh kiện ST20CX
Giải thích chi tiết về linh kiện  Instruction Set Reference Manual
PDF  212 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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ST20CX bảng dữ liệu(HTML) 82 Page - STMicroelectronics

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fmul
®
82/212
fmul
fractional multiply
Code: 27 F2
Description: Multiply Areg by Breg treating the values as fractions, rounding the
result. The values in Areg and Breg are interpreted as fractions in the range greater
than or equal to -1 and less than 1 - i.e. the integer values divided by 2BitsPerWord-1.
The result is rounded. The rounding mode used is analogous to IEEE round nearest;
that is the result produced is the fraction which is nearest to the exact product, and, in
the event of the product being equidistant between two factions, the fraction with least
significant bit 0 is produced.
Definition:
if (Areg
= MostNeg) and (Breg = MostNeg)
– MostNeg interpreted as -1
{
Areg
′← undefined
IntegerOverflow
}
else
Areg
′← (Breg × Areg) /
roundnearest 2
BitsPerWord-1
Breg
′← Creg
Creg
← undefined
Error signals:
IntegerOverflow can occur.
Comments:
Secondar y instruction.



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