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BF609 USB clock set-up

Question asked by FlyingHigh on Nov 21, 2017
Latest reply on Jan 16, 2018 by Jithul_Janardhanan

I am moving my software from BF609 eval board into my target board. I have problem in setting-up USB clock. On eval board there is 48MHz oscillator and my software runs OK. However, on my target board there is 24MHz quartz. I verified on oscilloscope that it generates required frequency, but I am not able to set-up USB clock. For that purpose I updated USB_PLL_OSC register. Simply updating this register has no effect. I tried to modify PLLM field with value 20 instead of default 10. I was also trying to set the PLLMSEL field, also without success. Is anybody able to help me with this subject ?