What is the difference detween ISR & function call
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Answer Posted / kent sar
Here are some of the differences:
1. Fuction call has no inputs and return args
2. ISR is triggered by external events
3. ISR may need special interrupt handling upon entry and
exit.
i.e. IRQs masking to enable or disable interupts,
4. Function call and ISR stack frame are different
5. ISR returns with an interupt return (IRET) to
restored not only call stack context but also
interrupt level.
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