I've a colleague who is using the 32-bit timer of an STM32 to trigger and interrupt handled pin toggle rather than using the 16-bit hardware Timer on the pin that needs toggling. The frequency on that pin varies a lot in use. When I wrote bringup code I used the 16bit Timer and a prescaler and that is a very small sacrifice compared to using 32bit resolution, particularly as the more interesting frequencies are high enough to have ARR below 2^6 for a PSC value of 0.
Presuming the interrupt is of the highest priority, I can't think of a good argument other than the intelligence of the interrupt approach. Is it correct to assume that the propagation delay of the pin toggle will be constant and therefore not a source of jitter? The frequency in use doesn't get high enough for the propagation delay to limit the operating frequency.
The colleague is a software developer rather than an embedded one and I often find I know that something isn't the way I would do it, but I can't put my finger on why.
