>what the state of the output lines are after power up. I hope that they are
>low but I can't find anny info on the subject.

What port are you talking about ?
All port are in high impedance input state at reset, this is the normal
situation after a reset, specially for a HC11. But it's also true for
many other microcontroller, because the chip designer doesn't know
what it is connected to.

Hope this will help you.
        Philippe.