The difference between edge trigger and level trigger __ electronic circuit

Level trigger, is only when the high level to do the specified thing,
Edge trigger, that is, there is a high level to the low level conversion, or turn over conversion, this conversion process triggers an action.
Rising along, as the name suggests, is a low level to high level conversion of the moment, such as
_____
____/, in this figure,/part is the ascending edge,

____
\_____, this figure, \ Part is the descent along


The level is the voltage, the high level is the high voltage, the low level is the low voltage
High level trigger is when the voltage is higher than the trigger
Edge trigger is when the voltage from high to low or from low to high when the trigger
The rise along the trigger is triggered when the voltage rises from low to high
The descent along the trigger is triggered when the voltage is reduced from high to low

Edge trigger: Rising along and descending along, this is learning to count the electricity all learned, simply said that the level of change that moment.

Level trigger: Generally refers to the low level, that is, the level becomes low after all the time.

If it is falling along the trigger, the trigger occurs when the transition from high to low is triggered. The low level is maintained for as long as it is produced only once.

If it is a low level trigger, then the interruption in the low level time is always valid. If you exit the interrupt program before the level is restored, you will be interrupted again after exiting. The trigger is not repeated as long as it does not exit. My practice is to close the interrupt before exiting, and then open it when there is time behind.