Renesas R5S72625 Manual De Usuario
Section 3 Floating-Point Unit (FPU)
Page 96 of 2108
R01UH0134EJ0400 Rev. 4.00
Sep
24,
2014
SH7262 Group, SH7264 Group
3.2
Data Formats
3.2.1
Floating-Point Format
A floating-point number consists of the following three fields:
Sign (s)
Exponent (e)
Fraction (f)
This LSI can handle single-precision and double-precision floating-point numbers, using the
formats shown in figures 3.1 and 3.2.
Exponent (e)
Fraction (f)
This LSI can handle single-precision and double-precision floating-point numbers, using the
formats shown in figures 3.1 and 3.2.
31
30
23
22
0
s
e
f
Figure 3.1 Format of Single-Precision Floating-Point Number
63
62
52
51
0
s
e
f
Figure 3.2 Format of Double-Precision Floating-Point Number
The exponent is expressed in biased form, as follows:
e = E + bias
The range of unbiased exponent E is E
min
– 1 to E
max
+ 1. The two values E
min
– 1 and E
max
+ 1 are
distinguished as follows. E
min
– 1 indicates zero (both positive and negative sign) and a
denormalized number, and E
max
+ 1 indicates positive or negative infinity or a non-number (NaN).
Table 3.1 shows E
min
and E
max
values.