Hello Antoine, On some other devices, a value of 0x1C in the SYSRSTIV register indicates a PLL unlock (PUC) reset. This does not make much sense seeing as how the MSP430F5435a does not have a USB peripheral. Here is a previous thread of a similar issue: e2e.ti.com/.../311940 Are you able to easily reproduce this behavior, and what is done in the device firmware before a reset occurs in these instances? Can you provide a simple code example that demonstrates the problem? Are you using a TI EVM or custom PCB? Regards, Ryan
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