Try to read Reset Status Register (RSR) after reset, it provides information about reason of reset.
Regards,
Bulat
I checked the RSR using a debugger, but couldn't find any particular cause. I suspect Check Stop, but the output signal / CK_STP_OUT was not in Check Stop Mode either.
Thank you,
hiroyukiO
All possible reasons of HRESET assertion are listed in section 5.1.1 of the manual. Checkstop reset can happen only if you set RMR[CSRE] bit.
Regards,
Bulat