Thanks for reply.Just after I enable the VREFBUF peripheral, cube display it using LL, but if I click it, it will change to empty, after that I only can select HAL in list box.For cleaness reason, I am trying to create a pure LL project:)BTW: LL driv...

Got it. Thanks a lot.It means at the HW reset state, timer will generate TRGO signal whenever by UG event.

Only initialized timer Clock Division,ARR, counter mode, then raise an update event, I get TRGO/TRGO2 trigger.

Thank you very much.After tracing the HAL code, I find that at the time of software generate update event, all the trigger sources are in HW reset state. TRGO/TRGO2 trigger event sources have not been configured but trigger signal exist on TRGO/TRGO2...