[quote user="Kupe Kriszti"]As Ilmars suggested I tried to set the MCU to 8MHz and change the MCLK source divider to generate 1MHz or 8MHz, however the power consumption reduction for UART data transfer was only cca. 20% (from 5 to 4µA).[/quote] According to datasheet LPM0 current at 8MHz is 328uA (DCO and SMCLK at 8MHz), while at 1MHz it is 156uA. Actually this is why I suggested to not bother to change DCO freq - because difference of runnning DCO at 8MHz versus 1MHz is just 172uA or even lower if you run SMCLK at 1MHz and don't change it. How do you measure consumption? - To correctly measure UART TX consumption, you shall craft test of continuous UART transmission.
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