STM32F410: ITRx "reserved"?

[RedScorpio95]

Hi guys,

can someone please explain the internal trigger connections for the stm32f410 controllers to me?

According to the referance manual (RM0401, see below) only TIM1 and TIM5 can be configured as slave timers with just ONE possible internal trigger source??? Or what does "reserved" mean?

And most important to me: Why is it even possible to choose all ITRx for all TIMx in STM32CubeMX then? How - for example - can I choose ITR3 for TIM9 not knowing the timer connected to ITR3? I'm lossssssst

Thanks in advance!

[Sarra.S]

Hello @RedScorpio95,

There is a table for internal connection in each timer section in RM

For TIM9 ITR3, check Table 65

[RedScorpio95]

thanks for the reply!

ok, fair (in case of TIM9), but why is it possible to choose ITR2 for TIM9 in CubeMX then? Does this mean in general it's somehow possible to choose ITR2 as trigger source although it's labled as reserved for TIM9? And howwww? :(

[Sarra.S · Accepted solution]

STM32CubeMX is designed to be a flexible tool, it show all possible options for internal triggers (ITRx) to provide a comprehensive view, you'll need to cross-reference the configurations with the reference manual! 

For reference, when an option is labeled as "Reserved" in the reference manual, it means that the specific internal trigger source is not available for use with that timer. Selecting a reserved option might lead to undefined behavior or simply have no effect

[RedScorpio95]

Well, that's..... not good 4me :')

But thanks for the clarification :) helped me a lot!!