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TM4C Timer 64位模式溢出...

要等到Timer工作在64bit模式下溢出,如果64bit都是F,工作在80MHz主频也要三十五个世纪才能溢出,如果只要33bit,也要好几十天才能溢出,那么64位模式是不是太鸡肋了,有什么实际用途.