![]() If your program spends a long time waiting in an interrupt, it may be easier to drop interrupts completely and use polling, which makes programming substantially easier. So in the essence your ISR execution time is limited by the desired IRQ response time. However, interrupts are most useful when you want to, well, interrupt your normal program flow to take a short action which must be carried out immediately, and the qualifiers "short" and "immediately" are naturally related: if your longest ISR takes 1ms, then an incoming interrupt of the same priority will have 1ms response time. Technically, it's not forbidden to even start an infinite loop inside an interrupt, so there is no top limit on ISR execution time. Having 25 possible interruptions in this processor family, it is encouraged to deal with them like punctual events, for allowing other interruptions to happen. delayMicroseconds() does not use any counter, so it will work as Micros() works initially but will start behaving erratically after 1-2 Requires interrupts to work, it will not work if called inside an ISR. To count, so it will never increment inside an ISR. ![]() Interrupts will be executed after the current one finishes in an order Sketch uses multiple ISRs, only one can run at a time, other Generally, an ISR should be as short and fast as possible. While the practice is to allocate the minimum possible execution cycles inside an interruption, and beside other general hardware specifications, there are not technical limitations for increasing them, if there are not any other interruption to be executed. ![]()
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