Please look the explanation of radix point here: en.wikipedia.org/.../Radix_point This is just a position which separates integer and fractional parts of the number. So for 8 bits fixed-point number you have the following: - the upper bit is "sign" - the next bit is an integer part - the last 6 bits represent a fractional part And for 16 bits number you have different amount of bits for integer and fractional parts depending on DP bit as follows from figure 1.7.
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