> 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 transmission.
>
> Some suggestions please?
>
> Thanks!!

Here's some cut-and-paste from a little project I finished recently.
Maybe it will help...

<cut>

;+++ Initialize ports

                clrf    PORTB           ; Set all outputs low for now
                clrf    PORTC
                BANK1                         ; Define i/o port direction
                movlw   B'11010000'     ; SDI and RX/TX are inputs (really!)
                movwf   TRISC           ; for port C.
                movlw   B'00000000'     ; All pins are outputs
                movwf   TRISB           ; for port B.
                movwf   ADCON1          ; Enable AN0-AN4 with Vref=Vdd
                movlw   0xff                  ; All pins are inputs
                movwf   TRISA           ; for port A.
                BANK0
<cut>
;+++ Start SCI
                BANK1
                movlw   D'25'                ;  9600 baud
                movwf   SPBRG
                movlw   B'00100110'     ; Asnyc, 8 bit, TX on, hi speed
                movwf   TXSTA
                BANK0
                movlw   B'10010000'     ; Enable UART and receiver
                movwf   RCSTA
<cut>
SCI_CHAR_OUT:                   ; Send an ascii character out theSCI
                                                ; Enter with char to be sent in
W
SCI_DL:         btfss   PIR1,TXIF        ; Is TXREG ready?
                goto    SCI_DL                 ; No, wait
                movwf   TXREG                       ; Yes, send the character
                return                                    ; Done.