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系统延迟函数

如何根据系统的时钟,计算SysCtlDelay(number)的延时时间?

例如在这个系统时钟情况SysCtlClockSet(SYSCTL_SYSDIV_4|SYSCTL_USE_PLL|SYSCTL_XTAL_16MHZ|SYSCTL_OSC_MAIN);

SysCtlDelay(1)的延时时间是多少?