AS7265X datasheet(27/63 Pages) AMSCO

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[v1-04] 2018-Jul-09

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AS7265x − Detailed Description

4-Byte Floating-Point (FP) Registers

Several 4 byte registers (hex) are used by the AS72651. Here is

an example of how these registers are used to represent floating

point data (based on the IEEE 754 standard).

Figure 25:

Example of the IEEE 754 Standard

The floating point (FP) value assumed by 32 bit binary32 data

with a biased exponent e (the 8 bit unsigned integer) and a 23

bit fraction is (for the above example):

0 0 1 1 1 1 1 0

0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

3E (hex)

20 (hex)

00 (hex)

byte 3

byte 2

byte 1

byte 0

0 0 1 1 1 1 1 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

exponent (8 bits)

fraction (23 bits)

24 23

16 15

8 7

sign

= 0.15625

(EQ1)

FPvalue

–

()

sign

1b23 i

–



–

⋅







e 127

–

()

⋅⋅

FPvalue

–

()

1b23 i

–



–

⋅







124 127

–

()

⋅⋅

FPvalue

1 2

–

() 2

–

0.15625

⋅⋅

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