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TDA4VM: How to modify pwm's clock source?

Part Number: TDA4VM

Hi,

I refer this demo mcal_drv/mcal/examples/Pwm/PwmApp_Gpt to get a pwm. But I found the timer clock source is 19.2Mhz and I need a 500Khz frequency. Then because this timer clock source I cannot get exact 500Khz. Just 505Khz. So how do I modify the timer clock source to 20Mhz(or 25Mhz....) to let me get a 500Khz frequency? Thanks.

Regards.