MC68LC040RC25A Datasheet, PDF (253/442 Pages) Freescale Semiconductor, Inc – M68040 Users Manual

Freescale Semiconductor, Inc.
Table 9-4. Double-Precision Real Format Summary
Data Format
63 62 52 51
0
se
f
Field Size (in Bits)
Sign (s)
1
Biased Exponent (e)
11
Fraction (f)
52
Total
64
Positive Fraction
Negative Fraction
Interpretation of Sign
s=0
s=1
Normalized Numbers
Bias of Biased Exponent
+1023 ($3FF)
Range of Biased Exponent
0 < e < 2047 ($7FF)
Range of Fraction
Zero or Nonzero
Fraction
Relation to Representation of Real Numbers
1.f
(–1) ^s × 2e–1023 × 1.f
Denormalized Numbers
Biased Exponent Format Minimum
0 ($000)
Bias of Biased Exponent
+1022 ($3FE)
Range of Fraction
Nonzero
Fraction
Relation to Representation of Real Numbers
0.f
(–1) ^s × 2 ^–1022 × 0.f
Signed Zeros
Biased Exponent Format Minimum
0 ($00)
Fraction (Mantissa/Significand)
0.f = 0.0
Signed Infinities
Biased Exponent Format Maximum
2047 ($7FF)
Fraction
0.f = 0.0
NANs
Sign
Biased Exponent Format Maximum
Fraction
Representation of Fraction
Nonsignaling
Signaling
Nonzero Bit Pattern Created by User
Fraction When Created by FPCP
0 or 1
255 ($7FF)
Nonzero
1xxxx…xxxx
0xxxx…xxxx
xxxxx…xxxx
11111…1111
Approximate Ranges
Maximum Positive Normalized
Minimum Positive Normalized
Minimum Positive Denormalized
1.8 x 10308
2.2 x 10–308
4.9 x 10–324
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M68040 USER’S MANUAL
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