> Here's a good starting point for blinking an LED with RA4. When you
> understand why the 4K7 is in there, you can probably write software
> that allows you to leave it out. ;-)
>
>                             Vdd
>                              +
>                    +---------+-----+
>                    |               |
>                    |              .-.
>                Vdd |              | |470R
>            .-------o-----.        | |
>            |             |        '-'
>            |             |         +--------+
>            |  PIC        |    LED  |        |
>            |             |         V /     .-.
>            |             |         - /     | |
>            |             | RA4     |       | |
>            |          +--o----+    |    4K7'-'
>            |          |  |    |    |        |
>            |          |  |    +----+--------+
>            |       ||-+  |
>            |       ||<-  |
>            |      -||-+  |
>            |          |  |
>            |          |  |
>            |          |  |
>            '----------|--'
>                      ===
>                      GND

I don't see what purpose the 4.7Kohm resistor is serving either.

It will cause RA4 to float all the way to Vdd when off, making it easy to
see with a scope.  But, it would be better connected directly between RA4
and Vdd for that purpose, The LED would pull RA4 high enough to be easily
visible anyway, and I don't see how any software would make a difference.


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