>
>RA4 is open drain by necessity and you use it as such because that's how
>they made it :-)
>
>HOWEVER it can be useful. The pin can have voltages applied to above Vdd, as
>there is no upper protection diode as their is on "normal" I/O pins. As long
>as you don't exceed the rated operating voltage for this pin (12v from
>memory) you can switch "high side" loads.


RA4 is rated only to a maximum of 8.5V according to the 16F87xA data sheets.
Regards,

Jim



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MPLAB compatible PIC programmers.
NEWFOUND ELECTRONICS P/L
http://www.newfoundelectronics.com
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