I appologise for the lack of comments.

I changed from a standard bcf on PORTC as I have read about the
read-modify-write problems.  When I call this sub, I put the number of the
bit I want to clear in the W register.  This then reads PORTC and places it
in RAM_PORTC, clears the bit in the variable and writes the entire byte back
to PORTC

Regards
Stewart
> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
> Of Jan-Erik Soderholm
> Sent: 28 June 2006 10:19
> To: piclist@mit.edu
> Subject: RE: [PIC] LCD Interface HD44780
> 
> Stewart Abel wrote :
> 
> > I have put my code below.  Can anybody see where I have
> > gone wrong or suggest anything I can try please?
> 
> First, there is not a single comment in the code so one
> can verify what you *think* you are doing.
> 
> Then, please explain what this code does :
> 
> > clear_PORTC_bit
> > 	movwf	R_BIT
> > 	movfw	PORTC
> > 	movwf   RAM_PORTC
> > 	bcf	   RAM_PORTC, R_BIT
> > 	movfw	RAM_PORTC
> > 	movwf	PORTC
> >
> > 	return
> 
> In particular how the BCF works...
> 
> Regards,
> Jan-Erik.
> 
> 
> 
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