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TM4C1294 定时器控制ADC采样率

在TM4C1294芯片上,我用定时器控制ADC的采样率,在低于512K的时候可以正常采样。当采样率高于512K的时候不能正常采样,通过观察波形,现在的采样率实际是512K。请问有什么问题吗?