SH7672 datasheet(102/1292 Pages) RENESAS

Part #	SH7672

Description	32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7670 Series

PDF	1292 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

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Section 3

Floating-Point Unit (FPU)

Rev. 1.00

Nov. 14, 2007

Page 76 of 1262

REJ09B0437-0100

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.

Figure 3.1

Format of Single-Precision Floating-Point Number

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 Emax + 1. The two values Emin – 1 and Emax + 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 Emax values.

SH7672 Datasheet(PDF) 102 Page - Renesas Technology Corp