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AS7265X データシート(PDF) 28 Page - ams-OSRAM AG |
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AS7265X データシート(HTML) 28 Page - ams-OSRAM AG |
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28 / 64 page ![]() ams Datasheet Page 27 [v1-04] 2018-Jul-09 Document Feedback 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 31 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) 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 0 31 23 30 22 0 sign = 0.15625 (EQ1) FPvalue 1 – () sign 1b23 i – i1 – 23 2 i – ⋅ + 2 e 127 – () ⋅⋅ = FPvalue 1 – () 0 1b23 i – i1 – 23 2 i – ⋅ + 2 124 127 – () ⋅⋅ = FPvalue 1 1 2 2 – + () 2 3 – 0.15625 = ⋅⋅ = |
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