Erik,

I agree the manual is slightly confusing on this point.
I have used this part and it has a/d converters on Port 1, and the a/d converters are the default, which is accomplished by writing a '1' to each port pin (0FFH hex). Port 1 can not be configured as a digital output. The Port 1 pins become digital inputs if you write a zero to any of the Port 1 pins.

Jacob