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There are a number of possible causes for a microcontroller to reset itself, for example:

  • brown-out or power-out

  • watchdog timer

  • reset initiated from software (to programmatically enter bootloader, etc)

I'm wondering if there is a way to figure out, when a microcontroller starts up, what was the reason for the last reset - perhaps using some kind of flags that survive reset. In particular I'm on the MSP430F5xxx series.

The use case is to avoid a cycle where some part of the self-test routine (for example) causes a glitch on the power rail, and then the micro resets itself and runs the self test again, repeat (until it succeeds).

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You can get the reset source from checking the system reset interrupt vector (SYSRSTIV), there is a good description on the TI wiki (Handling MSP430 System Reset Events).

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