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MSP430F5418A: Watchdog timeout results reset with cause of SVSH POR

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Part Number:MSP430F5418A

My configuration is:

PMMCTL0_H = PMMPW_H;
PMMRIE = SVSHPE;
SVSMHCTL = SVSHE;
SVSMLCTL = 0;

SVSH enabled, POR generation by SVSH enabled, all others SVS and SVM disabled.

My problem is: when WDT overflows, reset is generated, but SYSRSTIV register contains only one SVSH (0x0E) code instead of WDT time out (0x16) code. How to use watchdog timer together with SVSH in normal mode with POR generation by SVSH enabled? Why SVSH generates POR in result of WDT's PUC?


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