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SH7785 Datasheet(PDF) 156 Page - Renesas Technology Corp |
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SH7785 Datasheet(HTML) 156 Page - Renesas Technology Corp |
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156 / 1692 page  6. Floating-Point Unit (FPU) Rev.1.00 Jan. 10, 2008 Page 126 of 1658 REJ09B0261-0100 6.2 Data Formats 6.2.1 Floating-Point Format 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. 31 se f 30 23 22 0 Figure 6.1 Format of Single-Precision Floating-Point Number 63 se f 62 52 51 0 Figure 6.2 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 6.1 shows floating-point formats and parameters. |
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