MC68LC040RC25A Datasheet, PDF (254/442 Pages) Freescale Semiconductor, Inc – M68040 Users Manual

Freescale Semiconductor, Inc.
Table 9-5. Extended-Precision Real Format Summary
Data Format
95 94 80 79 64 63 62
0
se
uj
f
Field Size (in Bits)
Sign (s)
1
Biased Exponent (e)
15
Zero, Reserved (u)
16
Explicit Integer Bit (j)
1
Mantissa (f)
63
Total
96
Input
Output
Interpretation of Unused Bits
Don’t Care
All Zeros
Positive Mantissa
Negative Mantissa
Interpretation of Sign
s=0
s=1
Normalized Numbers
Bias of Biased Exponent
+16383 ($3FFF)
Range of Biased Exponent
0 < = e < 32767 ($7FFF)
Explicit Integer Bit
1
Range of Mantissa
Zero or Nonzero
Mantissa (Explicit Integer Bit and Fraction )
Relation to Representation of Real Numbers
1.f
(–1) ^s × 2e–16383 × 1.f
Denormalized Numbers
Biased Exponent Format Minimum
0 ($0000)
Bias of Biased Exponent
+16383 ($3FFF)
Explicit Integer Bit
0
Range of Mantissa
Nonzero
Mantissa (Explicit Integer Bit and Fraction )
Relation to Representation of Real Numbers
0.f
(–1) ^s × 2 ^–16383 × 0.f
Signed Zeros
Biased Exponent Format Minimum
0 ($0000)
Mantissa (Explicit Integer Bit and Fraction )
0.0
Signed Infinities
Biased Exponent Format Maximum
Explicit Integer Bit
Mantissa (Explicit Integer Bit and Fraction )
32767 ($7FFF)
Don’t Care
x.000…0000
9-10
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