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SH7261 Datasheet(PDF) 99 Page - Renesas Technology Corp

Part # SH7261
Description  32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series
PDF  1348 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

SH7261 Datasheet(HTML) 99 Page - Renesas Technology Corp

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Section 3 Floating-Point Unit (FPU)
Rev. 2.00 Sep. 07, 2007 Page 67 of 1312
REJ09B0320-0200
Section 3 Floating-Point Unit (FPU)
3.1
Features
The FPU has the following features.
• Conforms to IEEE754 standard
• 16 single-precision floating-point registers (can also be referenced as eight double-precision
registers)
• Two rounding modes: Round to nearest and round to zero
• Denormalization modes: Flush to zero
• Five exception sources: Invalid operation, divide by zero, overflow, underflow, and inexact
• Comprehensive instructions: Single-precision, double-precision, and system control
When the FD bit in SR is set to 1, the FPU cannot be used, and an attempt to execute an FPU
instruction will cause an FPU disable exception.
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.
31
30
23
22
0
s
e
f
Figure 3.1 Format of Single-Precision Floating-Point Number



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