>
>     1) No matter what I do, I can't set the PORTA.4 pin HI. If I
> set it LO,
> it's ok. When I set it HI, it seens to go to high impedance state. Someone
> can tell me what's going on?
>

PortA.4 is open collector output. That means that it can only tie the pin to
ground. It doesnt have the bit to connect it to Vcc like the other pins do.

john