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ST20C2 bảng dữ liệu(PDF) 196 Page - STMicroelectronics

tên linh kiện ST20C2
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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ST20C2 bảng dữ liệu(HTML) 196 Page - STMicroelectronics

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unpacksn
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unpacksn
unpack single length fp number
Code: 26 F3
Description: Unpack a packed IEEE single length floating point n umber. Areg
initially holds the packed number, and the instruction returns the exponent in Breg and
the fractional field in Areg, not including the implied most significant bit for normalised
numbers. In addition a code indicating the type of number is added to 4 times the
initial value of Breg and left in Creg. The codes are:
0if Areg is zero
1if Areg is a denormalised or normalised number
2if Areg is an infinity
3if Areg is not-a-number
Definition:
Areg
′← fractional field contents of Areg
Breg
′← exponent field contents of Areg
Creg
′← 4 × Breg + ‘code’ of type of Areg (see above)
Error signals: none
Comments:
Secondar y instruction.
See also:
roundsn postnormsn



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