porta.0 and porta.2 only goes high with HIGH command with PIC18F45K80

[Tabsoft]

This might be a read-modify-write issue.
The 18FK4580 has Output Latch registers.
You should try writing to the port via the LATA register instead of the PORTA register.

[bmoe79]

After taking a quick look in the datasheet it seems like that coulld be it.
I will test that tomorrow.
Thanks.

[AvionicsMaster1]

You don't say what you've got hooked up to the port pins. Could you post a schematic?

[Archangel]

Make sure to disable comparators & ECCP module. Using HIGH /LOW commands disables all analog (generally) for you. PICs default to Analog inputs and you have to be sure to turn it all off to get digital to work. And it makes sense too, analog inputs are incapable of causing any "unintended" actions downstream, like shorting something out or causing a machine to suddenly start running on power up. It is for THAT reason you should set your port states prior to assigning TRIS to outputs.

[bmoe79]

Setting the outputs with latx.x instead of portx.x solved the problem.
Tanks.

[Tabsoft]

Glad to hear this got you moving ahead.

There are plenty of posts on this forum regarding read-modify-write as well as a straight internet search on the subject if you want to understand the issue better.