Hi Mark, thank you for your reply. Unfortunately, I can`t understand the system exactly. I will ask in another way this issue: For example if I select the High Speed System Clock (fMX) as the Main System Clock(fMAIN). X1 and X2(EXCLK) are selectable for High-speed system clock. How should I decide to select X1 or X2, what is the criteria for this selection ? X1 and X2 are generated from same clock source at the schematic of RL78G13 Stick.
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