Hello @hdemi.1 ,
Yes, you can used the same timer to generate external timer clock and interrupt at the same time.
I recommended, when you configured the timer, to refer at this AN4013 "STM32 cross-series timer overview" application note and precisely section 2. General-purpose timer modes.
Also I advise you to make a look at this article “How to generate a one second interrupt using an STM32 Timer�? may be help you.
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Kaouthar
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