Just to make sure you guys got it right.
LCD E pin (6) activate the LCD interface while it is in HIGH level, not
a transition L-->H or H-->L, it is just purely HIGH level.
Most LCDs require a minimum E HIGH width of 450ns, maximum raise time of
25ns. During the READ operation, data will be available at the Interface
no longer than 320ns after E settles HIGH.

        ___________________________________________
R/W____/
   ____
RS     \___________________________________________


               450ns              450ns
                min                min
             _________         __________
E  _________/         \_______/          \_________
                 _____             ______
Data____________/     \___________/      \_________

        --->|   |<--- Delay max 320ns


If you try to read data earlier than 320ns after raise the E pin, it is
possible that you get wrong data. If you are not sure, include some
dummy instructions after raising E and Read the port.


Wagner.

Tim Hamel wrote:
>
> I apologize...E does NOT go from L->H, it's negative-edge (High->Low).
>
> Sorry,
>
> Tim Hamel
>
> In a message dated 4/21/00 9:52:58 AM Pacific Daylight Time, TekPhobia writes:
>
> > Dale,
> >
> >  While I haven't actually tried a BUSY bit read (I use a delay too), it
> seems
> > rather simple. The way I see it is:
> >
> >  RS=Low
> >  R/W=High
> >  E=Low -> High
> >  Read Bit-7
> >
> >  No offense, but is that how you're doing it? If it is, and the LCD still
> > goes schitzo, then I'll work on this as a weekend project (teenagers have
> > more free-time than working adults <g>). If I figure it out, I'll be more
> > than happy to post the code!
> >
> >  Regards,
> >
> >  Tim Hamel