SPRACK2A September   2019  – March 2020 TMS320F280021 , TMS320F280021-Q1 , TMS320F280023 , TMS320F280023-Q1 , TMS320F280023C , TMS320F280025 , TMS320F280025-Q1 , TMS320F280025C , TMS320F280025C-Q1 , TMS320F280040-Q1 , TMS320F280040C-Q1 , TMS320F280041 , TMS320F280041-Q1 , TMS320F280041C , TMS320F280041C-Q1 , TMS320F280045 , TMS320F280048-Q1 , TMS320F280048C-Q1 , TMS320F280049 , TMS320F280049-Q1 , TMS320F280049C , TMS320F280049C-Q1

 

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3.1.1 TMU Type1

Two instructions have been added to the instruction set of the Trigonometrical Math Unit (TMU) on F28002x to support computation of the floating-point power function “powf”. These instructions calculate the inverse binary exponent in the base two logarithm and can be combined to compute the power of a floating-point number raised to the power of another floating-point number. This calculation would typically take 300 cycles using library emulation, but takes less than ten cycles using the new instructions. An example of the application of the power function is non-linear proportional integral derivative control (NLPID), which is a component of the C2000 Digital Control Library.