AS7262 datasheet(21/47 Pages) AMSCO

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[v1-00] 2016-Dec-16

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AS7262 − Detailed Description

4-Byte Floating-Point (FP) Registers

Several 4-byte registers (hex) are used by the AS7262. Here is

an example of how these registers are used to represent floating

point data (based on the IEEE 754 standard):

Figure 19:

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

FP value

–

()

sign

– 2

–









e127

–

()

⋅

FP value

–

()

– 2

–









124

127

–

()

⋅

FP value

–

() 2

–

0.15625

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