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8051F120 Hardware Interrupt

Hi all. I am fairly new to micro controllers and I am wondering how to go about creating a hardware interrupt with the 8051F120.

I have a simple program and I want a button to be a hardware interrupt as at the moment i have tried to embed it in sections of the code where I think it will occur, but it is causing bugs.

As far as I am aware the only way I can do it is by creating an interrupt after a given time period with the timers. Is a way to create an interrupt when a particular pin changes state?

Regards,

Jeremy

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