Anyone who has used MSP430 knows that it has a hardware multiplier and can be designed to perform simple FFT calculations, but it is a separate module that requires writing two multipliers and then getting the result from the result. Most of the time, we don't need to do this at all, just treat it as 51, and do soft multiplication, which is very time-consuming. These two MCUs do not embed the multiplier into the MCU core MUL instruction.
Keywords：STM32
Reference address：STM32 hardware multiplier - another difference from MSP430 hardware multiplier
The STM32, including various processors using the Coretex M core, actually associates the hardware multiplier with MUL, so when you write a multiplication program calculation as usual, you are actually calling the multiplier. Fortunately, the STM32 can perform single-cycle multiplication and division, so it is dozens of times faster than software multiplication and division.
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