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ADC and ePWM

Hi Ti Community,

I have a theorical question and I just want a little bit explanation. I was looking at a sample codes came with f28377d board and I am little bit confused about the adc.

There is a register that decides the trigger of the adc named TRIGSEL and by changing it we define the trigger.
For example when I write 0 to this register the datasheet says that SOFTWARE ONLY and write 5 the ePWM triggers the adc.

I wonder the difference between them. System clock is quite enough for the conversion why do we need a ePWM to tirgger it ?

 Have  a nive day