How about the fact that TXREG is in bank 0 and TXSTA is in bank 1. I see
no bank switches in there. Same thing with spbrg (also in bank 1).

Harold


On Thu, 11 Jul 2002 11:57:19 -0400 "A.J. Tufgar"
<tufgaraj@MUSS.CIS.MCMASTER.CA> writes:
> Hey all,
>         I've got some modem routines working on the F627 however they
> are not making use of the USART, so I thought I'd be more efficent
> and
> get the modem working with USART.  However after many hours going
> through the datasheets and Tom McGahee's USART program I still can't
> get
> it up and running.  I'm trying to avoid using interrupts if possible
> and
> I'm trying just to get TX working for now.  Here's my code hope
> someone
> can help, Thanks.
> If I have both TXD and RXD set as outputs the RXD light will flash
> when
> I start my write routine by the TXD won't work. If RXD is an input
> nothing.
> The following code sets the port up.
>         MOVLW   d'25'
>         movwf   SPBRG
>         BCF     TXSTA, SYNC
>         BCF     RCSTA, SPEN
>         BSF     TXSTA, CSRC
>         BSF     TXSTA,  TXEN
>         movlw   0
>         movwf   TXREG
>
> My TX routine is:
> TX_MODEM
>         movf    dat_buf, w
>         movwf   TXREG
> ;wait_for_tx_to_end               ; If I put this loop in it won't
> exit
>         ;BTFSS  TXSTA, TRMT       ; The routine, so I put the delay
> in
>         ;goto wait_for_tx_to_end
>         movlw   .5
>         CALL    DELAY_N_MS
>         RETURN
>
>
> Thanks for an assistance in advance,
> Aaron
>
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