And it is similar as this problem. https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1126440/tms320f280025-pll-reference-clock-lost-detection-triggered-missing-clock-detect-not/4184003?tisearch=e2e-sitesearch&keymatch=SYSREF_LOST_MCD_EN#4184003
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