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MSP430F6726A: Read SYSRSTIV register

Genius 5835 points
Part Number: MSP430F6726A


My customers want to identify the cause of MSP430 reset. Because MCU resets when RST/NMI pin is touched.

I think that SYSRSTIV register is set to 04h if cause is RST/NMI. I would like to confirm that this is correct.
However, cause of the reset cannot be identified because SYSRSTIV register changes.

When should I confirm the SYSRSTIV register?