A key difference between edge-triggered and level-triggered interrupts lies in how they respond to input signals.
In the case of a falling-edge trigger, the interrupt is activated only when the signal transitions from a high to a low state. This means that the interrupt is generated once per pulse, making it ideal for external interrupts that arrive as negative pulses. This type of trigger ensures that the interrupt is only recognized once, even if the signal remains low for an extended period.
On the other hand, a level-triggered interrupt remains active as long as the input signal is at a low level. This can lead to repeated triggering if the interrupt service routine (ISR) exits before the signal returns to a high state. For example, if the interrupt is triggered, the ISR runs, and the signal is still low when the ISR finishes, the interrupt will be triggered again immediately. To avoid this, it's important that the external interrupt source is cleared during the ISR—usually by temporarily disabling the interrupt before exiting and re-enabling it later. This prevents the same interrupt from being triggered multiple times unnecessarily.
In practice, level-triggered interrupts are often used with hardware that can actively clear the interrupt condition, such as a button press or a sensor signal that can be reset. Edge-triggered interrupts, on the other hand, are more suitable for applications where the signal is short and needs to be captured precisely. Understanding the differences between these two types of triggers is essential for designing reliable and efficient interrupt handling systems.
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