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STM32F405 PLL: 168MHz to 84MHz - how to do this?

Question asked by roofie01 on Jul 8, 2015
Latest reply on Jul 10, 2015 by roofie01

I have an STM32F405 processor, with a 8MHz HSE crystal. It's set up to operate at 168MHz. To see if I can get suitable performance at a lower speed to save power, I'd like to change this (*not* on the fly) at the program start to 84MHz.

Is this done by changing the HSE value? It cannot be that I understand it, the HSE value must match the actual crystal frequency.

Thank you...