Sivaram M Cheekiralla wrote:
>
> Hi,
>
>   I need some help regarding the UART feature in 16F877. I need to send a
>   byte of data over the serial port to the PC(just for the sake of
>   implementing UART). I am using a 11.0592 MHz crystal oscillator.
>
>  1. DO I need to use a MAX232 driver or can I directly connect to the
>     serial port(DB 9) pins(TX and RX).
>  2. I have a windows PC. How can I read the serial port ? I mean if I send
>     the data from the PIC, how can I know what data I am receiving etc.
>     Are there any programs or s/w ?

I would use a MAX232 or similar to communicate. I think it's much more
reliable.

        org 0h

        ;
        ; START
        ; INTITIALISE PORTS ETC
        ;
;
; ------------------------------------
; SET BAUD RATE TO COMMUNICATE WITH PC
; ------------------------------------
; XTAL 11.0592 MHz, Baud Rate = 19200, No Parity, 1 Stop Bit
;
        movlw 0x23              ; 19200 baud
        movwf SPBRG
        movlw b'00100100'               ; brgh = high (2)
        movwf TXSTA             ; enable Async Transmission, set brgh
        movlw b'10010000'               ; enable Async Reception
        clrf STATUS             ; RAM Page 0
        movwf RCSTA

WaitLoop btfss PIR1,RCIF        ; wait for RX byte
         goto WaitLoop

        movf RCREG,W            ; get it
        movwf TXREG             ; echo it back
        goto WaitLoop

Download and use this to communicate and test...

http://www.bubblesoftonline.com/terminal.zip

--
Best regards

Tony

mICros
http://www.bubblesoftonline.com
mailto:sales@bubblesoftonline.com

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