sequential (109) Gap checking

https://kamchihau.blogspot.com/2024/07/sequential-109.html

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Ref: https://kamchihau.blogspot.com/2024/07/sequential-109.html .

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See the above picture. 
There's a register called Port A. 
Inside it, there're 4 fields. 
Those fields are the fields of subject, interrupt, object and value.
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Me: The clock line comes from the center-tap. The clock line just "cover" the register of Port A. The clock line never "cover" the "Overflow-area". Therefore, Stack-overflow can't occur.
Me: The principles of hacking isn't "Stack overflow".
John: The overfow-area is at mask-interrupt.