How to connect Wismo218 to the microcontroller with supply power 3.3V, there is an interface scheme?

A note at the end of the UART section in the Datasheet says,

So, can you run your microcontroller at 3.0V instead of 3.3V ?

No to start the microcontroller on 3.0V it is extremely undesirable (it is the minimum threshold of work of the microcontroller and used devices thus are disabled).

i suggest you use a logic level translator, all the major ic-companies have one or more

Yes - the clue is in the name… 8)

Implemented a solution from WM_PRJ_Q2400_PTS_005-007 page 19-20.
Everything works.

How to update firmware module Wismo218?