> I'm aware there's one counter per channel.
No, there is one counter per *timer*, not per *channel*. The formulation of some of your posts sounds much like you would like to count on multiple channels of one timer.
What you call "pulse stream counting" is called "external clock" in the STM32 realm, and is described directly in RM, in the TIM chapter in the External clock source mode 1 and External clock source mode 2 subchapters.
RM0090 in the TIM9-TIM12 chapter's Clock selection subchapter (which contains the external clock modes description) quite clearly states, that external clock mode is available only for TIM9 and TIM12 out of the bunch; it's even said there in bold typeface. Absence of TIMx_SMCR in TIM10/11/13/14 is a clear indication of the same. It's also quite obvious if you look at General-purpose timer block diagram (TIM10/11/13/14) figure at the beginning of the TIM9-TIM12 chapter, expecially if you compare it to the similar block diagrams for other timers - for TIM10/11/13/14, the clock straighforwardly comes from the internal clock only, as compared to clock being fed from the Slave-mode controller on the block diagram for other timers.
The external clock how these modes are selected through the TIMx_SMCR register. While it's not directly said, it quite straighforwardly indicates (similarly to the block diagrams) that it's the role of the slave-mode controller to select the clock (together with some other features, e.g. the encoder mode and the "synchronization" features like triggering and resetting from sources outside of the given timer). Then, if you refer to AN4013 Imen gave link to above, you can see in Table 4 that the single-channel timers don't have the "slave synchronization" features; the previous two tables help you to identify which timers for given family belong to which cathegory, including single-channel timers, to which the TIM10/11/13/14 in 'F407 belong.
I don't say the documentation can't be written clearer or can't be improved, but then it's also quite difficult to cater for all possible specific questions which may come up, in description of a relatively complex circuitry, so you might be required to read the whole chapter carefully to find the answers.
JW
