Hello Helgeland

In order to configure the analog pins you have to write to som internal pic registers ADCON0 , ANSEL and TRISIO registers.

Here is a link to a very useful document describing PIC12F675 and 12F683 settings.
Look to page 10 to 14

http://members.shaw.ca/picgroup/Reso...Cadilly-13.pdf

Hope this helps you