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ST20C2 Datasheet(PDF) 196 Page - STMicroelectronics |
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ST20C2 Datasheet(HTML) 196 Page - STMicroelectronics |
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196 / 212 page  unpacksn ® 196/212 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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