* Question
| What are the two types of interrupt signal triggering methods? |
* Answer
| (1) MODEK=0, falling edge triggering This trigger mode is characterized in that if a pin has been held low, the falling edge on other pins cannot be triggered again, and thus the interrupt cannot be requested.
2) MODEK=1, falling edge and low level trigger At this time, as long as the interrupt is enabled, any keyboard interrupt input pin will generate an interrupt request, and no interrupt will be lost. |
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