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RM46L852: SPI clock On/Off duty are not 50%/50%

Part Number: RM46L852

Hi everyOne

I am doing with RM46L852, using Hal Cogen to setup SPI Speed.

One thing i can not understanding that, if i setup speed at 7.875Mhz, the Clock pulse On/Off duty are not 50%/50%,  usually the On/Off duty are 45%/55%,

If i use 10Mhz or 5.5Mhz, i can have On/Off duty  50%/50% for eveytime.

Anyone have explaination, please help me. I want to use speed 7.875Mhz.

Thanks for your time.