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Using STM32CubeMX 4.14.0 with timer function "External clock source mode 1"

Question asked by diverger on Apr 16, 2016
Latest reply on Apr 19, 2016 by diverger
By RM0090 Reference manual, the time can work in "external clock source mode 1" mode. That is, the timer can be clocked by 'TIx' input. But I *can't* figure out how to configure it using cubeMX. For example, if I set TIM8's slave mode to "External Clock Mode 1", and set the trigger source to "TI1FP1", but the "Channel1" is grayed. The result is, I can't set CC1S! So 'External clock source mode 1' is hidden by STM32CubeMX actually. 

My target MCU is STM32F429IGx.