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为什么TUSB204的是外部时钟既可以接6M,也可以接48M??
有什么区别吗?是不是6M只支持低速USB(1.5Mpbs)? 48M支持中速USB(12Mpbs)??
其实是一样的,6MHz晶振输入,通过内部PLL也需要产生48Mhz来采集数据,如果直接是48MHz clock 输入的话,就不用通过内部PLL 产生48MHz频率了。
For 48-MHz operation, the clock cannot be generated with a crystal using the XTAL2 output because the internal oscillator cell supports only the fundamental frequency.