Generated when the change of state on one of the enabled interrupt lines is detected.
on_io_int(linestate as byte)
Working With Interrupts
0-255. Each bit of this value corresponds to one interrupt line in the order that these lines are declared in the pl_int_num enum.
Interrupt lines are enabled/disabled through the io.intenabled property. Another on_io_int event is never generated until the previous one is processed.