I know posting code is a no-no, but...

My boss was having trouble using the USART on the 16C74.  I spent 15
minutes or so changing the order in which the registers were configured
until it worked. i'm not saying this is the only way (or the right way)
to do it, but it works.  Note that the comments are not mine and are quite
ugly.

Regards,

Vincent Deno


;-------------------------------------------------------------------------------
-----------------
Setup_UARTS             setb    RP0             ;
                        setb    INTCON.6        ; interrupt control
                        clrb    TXSTA.2         ; set BRGH
                        mov     SPBRG,#129      ; set baud to 2400
                        clrb    TXSTA.4         ; clear sync
                        clrb    RP0             ;
                        setb    RCSTA.7         ; set spen
                        setb    RP0             ;
                        setb    PIE1.5          ; set rcie
                        clrb    RP0             ;
                        clrb    RCSTA.6         ; clear rx9
                        setb    RP0             ;
                        clrb    TXSTA.6         ; clear tx9
                        setb    TXEN            ; enable transmission
                        clrb    RP0             ;
                        setb    RCSTA.4         ; enable reception cren
                        setb    INTCON.7        ; set gie
                        ret                     ; return in bank 0
;-------------------------------------------------------------------------------
-------------------



> Hi all..
>
> I'am programming MIcrochip PIC16C73 and have problems with data transmission
> using USART registers?.
> First, I enable Tx,Rx pines with SPEN at RCSTA,
> then set TXSTA for async mode
> finally BRG register. When I send a character it looks like there is no transm
ission.
>
> Some suggestions please?
>
> Thanks!!
>

--------------
Vincent Deno
Design Engineer
Theta Digital Corp.
www.thetadigital.com
denovj@email.uc.edu
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