> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Tom
> Sent: Thursday, March 13, 2003 5:22 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [PIC]: BCF or MOVLW on TRISx
>
>
> Hi,
>
>    I have PORTD pull high.
>    Initialization: MOVLW  00H
>                    MOVWF  PORTD
>                    MOVLW  FFH
>                    MOVWF  TRISD ;set all input
>
>    I'm wondering if a single pin of portD can be
> toggle input or output by using BCF,
>    e.g
>        BCF  TRISD,7 ; to set bit 7 of portD as output
>
>  The above don't seem to work.
>
>  However, if i use:
>        MOVLW 7FH
>        MOVWF TRISD
>
>  I measure and confirmed that pin 7 of portD goes low.
>
>  Is it that BCF cannot be used?
>
Specify WHICH processor.
The TRIS register is mapped in some of the older precessors.
I do this trick on the 18C452s with no problems.
I use the direction of the port pins as a tristate.

  *
  |  __O    Thomas C. Sefranek   WA1RHP@ARRL.NET
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>
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