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SAADC : "The SAMPLERATE timer mode cannot be combined with SCAN mode, and only one channel can be enabled in this mode. " Why ?

it says "The SAMPLERATE timer mode cannot be combined with SCAN mode, and only one channel can be
enabled in this mode." , simply why ? 

When we set scan mode , and when we call sample task , is adc using internal timer to scan each channel ? is this the reason that we can not use adc's internal timer with scan mode or more than one channel ?