What is connected to the RX pin?  Do you have it connected to an
RS-232 level shifter?  If so, are you certain that the level shifter has
the appropriate connections to ensure that the pin tied to RX gives
the proper signal?  Could the input to the Receive buffer on the
level shifter be bad or floating?

Mike H.


>From: PSL <L030010@SINGNET.COM.SG>
>Reply-To: pic microcontroller discussion list <PICLIST@MITVMA.MIT.EDU>
>To: PICLIST@MITVMA.MIT.EDU
>Subject: [PIC:]F876 USART problem
>Date: Fri, 9 Jan 2004 23:51:15 +0800
>
>Hi All
>
>
>I am using 16f876 USART but I have encounter something odd
>below is a segment of my code
>
>
>      banksel     SPBRG    ; bank0
>      movlw      d'64'          ;  19200 baud @ 20 Mhz Fosc +0.16 err
>      movwf      SPBRG
>      movlw      b'00100100'     ; brgh = 1
>      movwf     TXSTA           ; enable Async Transmission, set brgh
>      banksel      RCSTA        ; bank0
>      movlw      b'10010000'
>      movwf      RCSTA           ; enable Async Reception
>      movf       RCREG,w
>      movf       RCREG,w
>      movf       RCREG,w         ; flush receive buffer
>
>Guess what i got a 5 voltage signal coming out of RC7/RX which is already
>configure as a input
>and all my recieve rountie did not work but the TX is still working
>
>anyone have encounter this before?
>
>Thanks
>
>--
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