Hi All PICers !

 > From: Jean-Francois Joly <jolyal@CAPITALNET.COM>
 > Subject:      PORTA Question!

 > Hello everyone!
 >
 > I would like to make a little program that sends a high on
 > the RA0 pin to light up a LED. I think it should be simple
 > enought, but because this is my first attempt in programming
 > a PIC, Im not to sure...
 >
 > This is the main part of the program. If something is wrong
 > or missing, please tell me!
 >
 >         BSF     PORTA, RA0      ; Want to put 1 on RA0 pin
 >         BSF     TRISA, TRISA0   ; Output a high on RA0 pin

           ^^^  bcf, at first.

What about ROM PAGE selecting ?  PORTA is on the 0-page, but
TRISA - on 1st once.
 You must write:
       bcf porta,ra0
       bsf status,RP0
       bsf trisa,0
       bcf status,RP0.

More better - to use macros and defines, for example:
;
#define  A0_ON    bsf porta,0
#define  A0_OFF   bcf porta,0
#define  A0_INP   bsf trisa & 0x7f,0
#define  A0_OUT   bcf trisa & 0x7f,0
;
PAGESET    macro pagenum
                if pagenum == 1
                  bsf status,RP0
                else
                  bcf status,RP0
                endif
           endm
;
;After that your program looks like :
;
          A0_ON
          PAGESET 1
          A0_OUT
          PAGESET 0
;

 > Would this work?

See before :-)

 >  Does it send the signal to the pin at the
 > same moment that I set in the TRISA register pin RA0 as
 > output?


Yes, of course.

   Best Wishes, Alex Torres.
   Kharkov, Ukraine, exUSSR.
   E-Mail To : altor@cook.kharkov.ua   via InterNet
               or 2:461/28             via FidoNet

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