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How many triggering modes does external interrupt have?

April 26, 2017external interrupt modes triggering

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How many triggering modes does external interrupt have?

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External interrupt can be set to be level-triggered and edge-triggered. The edge-triggered can be at rising edge or falling edge; the level-triggered can be at high level or low level. However, trigger method of NMI interrupt can only be selected from the falling edge or rising edge.