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我的28335用了4个采样通道，其他通道接地。HSPCLK设置成1/6=150MHz，单通道采时，采样率最高到4MHz，应该能到12.5MHz。采样保持周期设为0,1，结果都一样。什么设置会影响到采样率上不去呢?
楼主可能误解了文档中对28335最快转换时间为80ns的说明，请楼主看一下28335 datasheet的6.15.3 Sequential Sampling Mode 的时序图相信就会明白。
