SH7785 datasheet(157/1692 Pages) RENESAS

157 / 1692 page

6. Floating-Point Unit (FPU)

Rev.1.00 Jan. 10, 2008 Page 127 of 1658

REJ09B0261-0100

Table 6.1

Floating-Point Number Formats and Parameters

Parameter

Single-Precision

Double-Precision

Total bit width

32 bits

64 bits

Sign bit

1 bit

Exponent field

8 bits

11 bits

Fraction field

23 bits

52 bits

Precision

24 bits

53 bits

Bias

+127

+1023

max

+127

+1023

min

–126

–1022

Floating-point number value v is determined as follows:

If E = E

max + 1 and f ≠ 0, v is a non-number (NaN) irrespective of sign s

If E = E

max + 1 and f = 0, v = (–1)

s (infinity) [positive or negative infinity]

If E

min ≤ E ≤ Emax , v = (–1)

s2E (1.f) [normalized number]

If E = E

min – 1 and f ≠ 0, v = (–1)

s2Emin (0.f) [denormalized number]

If E = E

min – 1 and f = 0, v = (–1)

s0 [positive or negative zero]

Table 6.2 shows the ranges of the various numbers in hexadecimal notation. For the signaling non-

number and quiet non-number, see section 6.2.2, Non-Numbers (NaN). For the denormalized

number, see section 6.2.3, Denormalized Numbers.

SH7785 Datasheet(PDF) 157 Page - Renesas Technology Corp

SH7785 Datasheet(HTML) 157 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL