急求~~1、想输出6M甚至12M时钟，除了PWM之外还有什么方法？因为在用PWM输出时发现4M以上高频输出下降沿波形失真严重，完全不能当时钟用，还有没有别的方法？
2、想实现短时间延时如us、ms级，直接用delay之类的函数（函数体是for循环）会不会对任务的执行产生影响？SDK有类似的例程或者函数吗？
拜谢！！
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