An unintended reset has occurred during operation of a customer product equipped with the MSP430FR5869. Unintentional reset is probably PUC.
The following conditions have been known to cause an unintended reset.
・ LPM3 during standby
・ Reset uart reset
(UCA0CTLW0 & = ~ UCSWRST;)
Port 1 of uart is the same
・ Increase the amount of description of interrupt handlers
(Interrupt is watchdog timer interrupt)
・ It easily occurs at low temperatures
(Faulty devices occur between 5 ℃ and 15 ℃)
Also, under this condition, a reset occurs even if uart is operated by ACLK. When an unintended reset occurs, the ACCTEIFG flag is set to 1.
It does not occur in LPM2.
Does not occur unless UCA0CTLW0 & = ~ UCSWRST; is described
Or, it does not occur if the amount of description of the interrupt handler is small
Also, the customer has now tried on three devices, but all
Similarly, an unintended reset occurs.
What is the cause of this unintended reset?