Recently, I have been studying how to cancel the delay function in the program. After a period of exploration, I finally made some progress. I wrote a countdown timer. Countdown timers are used in many places in life. As long as the circuit is slightly improved, it can be made into a very practical thing. The program simulation passed. When I have time to make a real thing, I will post the program to share it.
I took a few random screenshots.
Simulation interface: 
Program interface: 
Source program, written roughly, if you like it, you can study it together
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