Schematic diagram of the three triggering modes of the trigger
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Schematic diagram of the three triggering modes of the trigger

Posted Date: 2024-01-27

A flip-flop is a memory device that changes its state under specific input signal conditions. The triggering method of a trigger refers to the way in which the trigger's state transition occurs under what input conditions. Common triggering methods include level triggering, edge triggering and pulse triggering.

Three triggering methods of triggers

The three triggering methods of flip-flops are: level trigger, edge trigger, and pulse trigger.

1. Level triggering: Level triggering means that the trigger changes state when the input signal remains at a specific level. The flip-flop remains in its current state while the input signal remains at a specific level of the flip-flop (usually high or low). Only when the level of the input signal changes will the flip-flop state change.

When the trigger signal is at a valid level (high or low), the input signal enters the flip-flop circuit and sets the flip-flop to the corresponding state. After the trigger signal becomes an invalid level, the input signal is blocked and the trigger state is maintained.

The status changes throughout the entire process with valid signals.

**Flip-flop type:**Level-triggered SR flip-flop, level-triggered D flip-flop

2. Edge Triggering: Edge triggering means that the flip-flop changes state when the input signal edges from low to high or from high to low. The edge flip-flop detects the edge change (rising edge or falling edge) of the input signal. When the edge flip-flop detects a specific edge, the state of the flip-flop will change, otherwise it will remain in the original state.

3. Pulse Triggering: Pulse triggering means that the trigger changes state when it receives a pulse signal of a specific width. The pulse trigger will determine whether the trigger condition is met based on the pulse width of the input signal. When the pulse width of the input signal reaches the preset trigger condition, the trigger state changes.

These three triggering methods play an important role in digital circuit design and can be used to implement functions such as state transition, timer control, and clock synchronization in sequential logic circuits. Choosing the appropriate triggering method depends on the specific application needs and design requirements.

Review Editor: Huang Fei


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