sequential (7)

https://wodewangzhishime.blogspot.com/2021/11/package-0101.html

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Ref:   https://wodewangzhishime.blogspot.com/2021/12/httpswodewangzhishime_26.html .

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Pilot: When the airplane start flying, everything is Ok. But, after 15 minutes, it mal-function. .The mal-function take effect after 15 minutes.Why??

Me: A timer.

Pilot: What is a timer ??

Me: A timer is how many Cycle . . .For example, after 200,000 cycle, the trick take effect. . 200,000 cycle is 15 minutes.

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if (time = up)

{

the trick take place; <-------- put the register on the system clock line.

}