The R8C architecture has four operating modes: RESET mode, Normal mode, Wait mode, and Stop mode. The default transition out of RESET is the Divide-by-8 Low-Speed On-chip oscillator mode. From this state, you can modify the clock control register to select either the Low-Speed or High-Speed mode of the On-chip oscillator, where there is no divider from the clock oscillation circuit. You can also select the Main Clock modes with either no frequency division or a division by 2, 4, 8, or 16. Upon a return from Stop mode, the clock always defaults to the Divide-by-8 mode of whichever clock was selected (On-chip oscillator or main clock) prior to the entry into Stop mode.