Jinx & I write:
> > >lcd_init movlw  0x30
> > >          movwf  portd
> > >          bcf    rs
> > >          bcf    rw
> > >          bsf    en
> > >          nop
> > >          bcf    en
> >
> > Are rs, rw & en on the same port? Personally I like a nop between them
> > if so to avoid the famous RMW bug. (feature?)

Fredrik asked:
>RMW bug? Please explain that to a newbie.

A RMW operation is when you do, say a BCF or BSF on a port pin. The PIC
actually reads the old port value in (not the output latch, but the actual
pins),
changes the specified bit, then writes the new value out to the port. Most of
the time this is fine. The problem occurs if you do consecutive BCF or BSF
operations on the same port. What happens is that the first RMW changes
a port pin's level but due to capacitance on the port pin, it takes (a
small but
finite) time to get to the new level. If it hasn't got to the correct level
before the
next RMW operation, the old (wrong) level may get read in and therefore used
as part of output value for that operation. Clear as mud?  :-)  An example:

start           ;00000000 all bits low to start with
BSF port,0      ;00000001 bit 0 starts going high but is slow due to
capacitance
BSF port,1      ;00000010 bit 1 goes high but bit 0 set low again due to RMW !

I hope this helps. I think the PIC data sheets mention about RMW operations.
Regards...

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