67. Level Trigger vs Edge Trigger

Issue:

• The circuit uses a D latch (level-triggered) with the push button connected to its Enable input.
• While the button is held, the latch remains transparent and continuously captures changing counter values.
• The stored value becomes the counter value at button release instead of the first button press.

Fix:

• Replace the D latch with a positive edge-triggered D flip-flop.
• The flip-flop captures the counter value only at the rising edge of the button signal.
• This ensures one random hex number is stored for each button press.

Difference Between Latches and Flip-Flops:

• Latch: Level-triggered; output can change while the enable signal is active.
• Flip-Flop: Edge-triggered; output changes only at a rising or falling clock/trigger edge.