Hi,
1- Is it software or hardware reset ?
R: The Watchdog is a software reset.
2- If reset pin is switched to low then high again , Does that mean that it is for sure hard reset ?
R: If the reset pin is switched to low and then high, it will trigger a hardware reset which is different from a hard reset. Hardware Reset only restarts the program loaded into your board (like the WDOG would do) and Hard Reset is the restoration of a device to the state it was in when it left the factory (all settings, applications and data added by the user are removed).
3- Is there a register to reflect reset reasons ?
R: There is a register for the KEA64 Sub-Family called SIM_SRSID (System Reset Status and ID Register) which indicates the cause for a reset. You can check this register at the chapter 12.2.1 from the reference manual: https://www.nxp.com/docs/en/reference-manual/KEA64RM.pdf#d30e40a1310
4- What is the effect of Invalid instruction on this target , jump to ISR and do WDOG reset if enabled or what is the behavior exactly please ?
R: An invalid instruction would jump to a Hard Fault, and then it would do a WDOG reset if it is enabled.
I hope this information can help you.
Best Regards,
Ricardo Delsordo
