The three pin which pointed here is control pin to LCD module.
R/W is convential read and active low write signal. Simply connect
them to R/W signal on HC11(if u run ur board on expanded mode) else
if you running your board in single chip then assign any pin from
general purpose port from hc11 and drive this pin HIGH when you need
to read the data from lcd module or drive it low when you want to
write a data to lcd module.
Next the RS, is Register Select signal. There are two register in
LCD Module, the instruction register and the data register. If you
drive this pin LOW it is under instruction register, when HIGH it is
under DATA register. Choose any pin from HC11 port and assign
correct logic level according to data type on the data bus. If your
board running in expended mode tied this with A0.
The E signal is enable signal. Strobe(from high to low) this signal
when you already send the valid data to the LCD Module. This is also
can be drive from any output pin from HC11. If you running in
expended mode then NANDed the memory decoder output and the E clock
Hope this will help you.
--- In email@example.com, Louis Bertrand <louis@...> wrote:
> I have an example of how to use the LCD on the Dragon12 board by
> If it's the same controller interface, you can map to the same bit
> numbers using PB0-7.
> Look for the article "Programming the LCD module on the Dragon12".
> gab1020012000 wrote:
> > I am undergraduate student and now doing my final year project .
> > I already build up my circuit which the pin of PE0/ANO is the
> > input signal , PB0-PB7 is connect to the 16*2 character lcd
> > Now the problem is I dont know the pin of lcd ( RS , E and R/W )
> > connect to which pin of HC11 ....
> > Anyone can give me some advice and tell me which part should I
> > consider ????