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18F4550 Inputs C4 and C5

 
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nazoa



Joined: 09 Feb 2007
Posts: 54

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18F4550 Inputs C4 and C5
PostPosted: Tue Feb 20, 2007 11:56 am     Reply with quote

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
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PostPosted: Tue Feb 20, 2007 1:44 pm     Reply with quote

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

USBEN=0;

This will turn off the USB hardware

Best Wishes
nazoa



Joined: 09 Feb 2007
Posts: 54

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Thanks!
PostPosted: Wed Feb 21, 2007 3:35 pm     Reply with quote

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
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PostPosted: Wed Feb 21, 2007 4:52 pm     Reply with quote

I like questions that can be answered this easily. Smile

Best Wishes
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