18F4550 Inputs C4 and C5

[nazoa]

Hello,

I am using the 18F4550 and I need to use pins C4 and C5 as ordinary logic inputs. I do not need the USB. My problem is that I am getting very erratic behaviour from the PIC. It seems unable to recognise when the pins go high.

I am not sure how I should disable the internal USB so that pins C4 and C5 are freed but I have the following line;

#fuses HSPLL,NOPROTECT,NOLVP,NODEBUG,NOUSBDIV,PLL5,CPUDIV1,VREGEN

Any suggestions where my problem could be? How is the internal USB disbled?

Thanks!

[Ttelmah]

#byte UCON=0xF6D
#bit USBEN=UCON.3

USBEN=0;

This will turn off the USB hardware

Best Wishes

[nazoa]

Ttelmah, thanks for your help. It now works fine. Also, it has helped in understanding how the various registers can be programmed. Much appreciated!

[Ttelmah]

I like questions that can be answered this easily.

Best Wishes