R01UH0822EJ0100 Rev.1.00
Page 149 of 1041
Jul 31, 2019
RX13T Group
9. Clock Generation Circuit
9.3.2
External Clock Input
shows connection of an external clock. Set the MOFCR.MOSEL bit to 1 and open the XTAL pin to operate
the oscillator by inputting an external clock signal.
Figure 9.4
Connection Example of External Clock
9.3.3
Notes on the External Clock Input
The frequency of the external clock input can only be changed while the main clock oscillator is stopped. Do not change
the frequency of the external clock input while the setting of the main clock oscillator stop bit (MOSCCR.MOSTP) is 0
(main clock oscillator is operating).
XTAL
EXTAL
Open
External clock input