On Fri, 28 Aug 2009 20:33:07 +0200, you wrote:

>I am trying to use the RC4 and RC5 pins of an 18F2550 as inputs. The 
>normal use of these pins is as USB data pins, but the datasheet seems to 
>state that they can also be digital inputs (but not outputs). Has anyone 
>done this succesfully? Any settings required, beyond UCON=0 ?

An old 18F4550 project of mine contains the following 

    // Undocumented by Microchip the disabled (power on default) USB
    // subsystem must have the internal transceiver disabled to use
    // RC4 and RC5 as digital inputs.
    UCFG = 0x08;

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