Shane Bolton wrote:
>
> I am new to the PIC world but I do have some experience with computer hardware and software.
>
> I have built a very basic 'F877 with the minimum support components running at 20MHz.
>
> I can program the device without any trouble but the CPU appears not to do anything.  I don't have
> any test equipment other than a good multimeter.
>
> I can measure about 2.5VDC on the clock pin - so I assume the oscillator is running.  Other voltages
> all look fine.


Hi Shane, there is a FAQ for the F87x series where
the chips default to analog inputs. You should make
sure you change these to digital or you will get
weird port functioning. Check the piclist.com FAQs?

My personal suggestion is to write a very neat
"setup" function for the F877 where you set up all
the hardware. You can cut and paste this to all new
projects, and if it is well commented it makes
life a breeze...
-Roman

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