I'd like UART to be as reliable as possible. Since baud rate 9600 is semi-standart I'd prefer to stick with that value.
Which option has more precise timing?
1) LFXT1CLK (32k crystal) -> ACLK -> UART
2) DCO (1MHz) -> SMCLK -> UART
slau144 says #1 has error rate 15.2% / 21.3% (TX/RX)
and #2 has 0.7% / 0.8%.
But DCO by itself is less precise than the crystal. So which one to choose?
Which option has more precise timing?
1) LFXT1CLK (32k crystal) -> ACLK -> UART
2) DCO (1MHz) -> SMCLK -> UART
slau144 says #1 has error rate 15.2% / 21.3% (TX/RX)
and #2 has 0.7% / 0.8%.
But DCO by itself is less precise than the crystal. So which one to choose?