R01UH0822EJ0100 Rev.1.00
Page 155 of 1041
Jul 31, 2019
RX13T Group
9. Clock Generation Circuit
9.7.4
Notes on Resonator Connection Pins
When the main clock is not used, the EXTAL and XTAL pins can be used as general ports P36 and P37. When using
these pins as general ports, be sure to stop the main clock (MOSCCR.MOSTP = 1). However, do not use the EXTAL and
XTAL pins as general ports P36 and P37 in a system that uses the main clock.
When the main clock is used, do not set P36 and P37 to output.