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RL78 series R5F111 microcontroller Reset source finding using RESF register


I am facing one problem regarding my recent circuit. My board is reset's  after every certain time interval. I am trying to identify the source of Reset whether it is internal or external. I haven't configure watchdog or low voltage detection bits n my software. I am trying to fetch value from RESF register but every time  I get the value 0x00. It means it is not reset from internal source or controller changes this value to 0 as per datasheet. What are the steps for fetching RESF value.

[locked by: AZ_Renesas at 9:34 (GMT 0) on 6 Mar 2024]