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C6748的UPP接口时钟输入,能直接接有源晶振么?



UPP的A通道作为输入口,UPP_CHA_CLOCK作为输入时钟引脚,让UPP_CHA_CLOCK外接有源晶振,可以么?

有源晶振的波谷一般会到出0V以下,有负向电压,甚至到-1V,还能不能接UPP_CHA_CLOCK引脚?

UPP_CHA_CLOCK引脚接时钟,这个时钟有啥要求没?