r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 156
r8a77850anbg
Manufacturer Part Number
r8a77850anbg
Description
Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R8A77850ANBG.pdf
(1692 pages)
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Part Number:
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6. Floating-Point Unit (FPU)
6.2
6.2.1
A floating-point number consists of the following three fields:
• Sign bit (s)
• Exponent field (e)
• Fraction field (f)
This LSI can handle single-precision and double-precision floating-point numbers, using the
formats shown in figures 6.1 and 6.2.
The exponent is expressed in biased form, as follows:
The range of unbiased exponent E is E
distinguished as follows. E
denormalized number, and E
Table 6.1 shows floating-point formats and parameters.
Rev.1.00 Jan. 10, 2008 Page 126 of 1658
REJ09B0261-0100
e = E + bias
Data Formats
Floating-Point Format
63
s
Figure 6.2 Format of Double-Precision Floating-Point Number
Figure 6.1 Format of Single-Precision Floating-Point Number
62
e
min
max
– 1 indicates zero (both positive and negative sign) and a
31
+ 1 indicates positive or negative infinity or a non-number (NaN).
s
52
30
51
min
e
– 1 to E
23 22
max
+ 1. The two values E
f
f
0
min
– 1 and E
0
max
+ 1 are
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