The transmission register can only hold one byte at a time, and you have
to wait for the transmission to complete before sending another byte.

You put a byte into TXREG, then you wait until TXIF goes high.  TXIF
goes high when the transmission buffer is empty, and low when you have
to wait.  A simple example follows:

hello

     movlw  'H'
     call   send
     movlw  'e'
     call   send
     movlw  'l'
     call   send
     movlw  'l'
     call   send
     movlw  'o'
     call   send
     movlw  '!'
     call   send
...
...
...

send                     ; Send subroutine.  Sends a byte from W,
     MOVWF  TXREG
wait                     ; and returns when byte is sent.
     BTFSS  0x0C, TXIF
     GOTO   wait
     return

I hope this helps!

-Adam

paul carns wrote:

>I'm working with two 16F876. They have to transmit and
>receive in back to back way (continuous way). I've
>tried to send one byte, and the receiver PIC receives
>it well. But when I increase the number of bytes to be
>transimited (for example three), the second PIC
>doesn't receive them well. Do you know the reason?
>And also I've observed that, in spite of I only call
>the transmision routine once, the transmiter PIC never
>stops to send the byte.
>
>Please, I would appreciate your answer a lot,because I
>need to run the program.
>
>Thank very much Tom.
>
>Paul Carns
>
>
>
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