For what its worth, I don't see anything that sets the TRIS bits for 
that port.  Or is that something that the compiler is supposed to take care of?

dwayne


At 06:14 PM 5/28/2010, Xiao Xu wrote:
>btw, here is my code if it helps:
>
>#include <pic.h>
>void main()
>{
>
>RA0=1;
>PORTAbits.RA0=1;
>NOP();
>}
>
>the 0-bit of PORTA(0x05 for 16F684) refuse to turn into 1!
>
>- Xiao Xu


-- 
Dwayne Reid   <dwayner@planet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
(780) 489-3199 voice          (780) 487-6397 fax
www.trinity-electronics.com
Custom Electronics Design and Manufacturing

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