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STM32F4 less jitter when using TIM1 with external trigger instead of TM3?

Question asked by martin on Feb 24, 2014
Latest reply on Feb 24, 2014 by waclawek.jan
In my application, I'm using TIM3 to generate a square-wave signal which is triggered by an external trigger using input TIM3_CH2. The problem is that there is some jitter, i.e., the generated square wave signal is not well locked to the trigger input (the jitter is in the order of 80ns).

Could this problem be alleviated by using TIM1 instead of TIM3? I think this may be the case since TIM1 is connected to the 168MHz clock internally, while TIM3 runs at 84MHz. Also, is there any advantage of using the external trigger input instead of the timer input channel?