GPRS 4,1V to uC 3,3V serial communication

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Hi all !

 

Picture is taken form datasheet.

Lines with X red are not used.

 

 

There is NO RESISTOR 5k6 on RXD from uC side (in red), why?

I suppose that form GPRS modules TXD line comes 4,1V and it should be divided by resistors.

 

Why is resistor divider placed on first line (uC  TXD -  module RXD) ?

 

 

Thank you for explanation !

 

 

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