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I have two articles on driving static LCDs you might find useful:

The first drives a 3 digit display directly with a PIC:
http://www.ubasics.com/driving_static_lcds
Very low power, very low cost.  Includes source code near the end.
Goes through what a static and multiplexed display is and the driving
methods for a static display.  You should only need a static display
for 3-4 digits.

The second article is Jinx's solutions:
http://www.ubasics.com/Jinxs_static_LCD_drive_solution
Only schematics.  One uses an LCD driver IC (another common part
ICM7211, but not the AY part you mention).  The other drives the LCD
with a few 74 series logic devices run from the PIC.  You might email
Jinx directly (he's on this list) to see if he can contribute code for
either of these solutions.

Good luck!

-Adam

2008/11/6 gardenyu <gardenyu2004@hotmail.com>:
>
> Hi
>
> I'm building a 3 digit LCD display trying to use a Microchip's AY0438 c=
ontroller. I read the C18 compiler library and found there are some prett=
y good library functions for Hitachi HD44780 LCD controller. This is weir=
d to me. Why do they write library functions for a driver which is not ev=
en their own product? I also noticed there are a lot samples everywhere f=
or driving the Hitachi chip, and very few on AY0438 driver. It turns out =
for a starter, it is much easier to use a much more expensive chip (80 pi=
n for Hitachi) to realize a very simple function.
>
> I bet the difference is that the Hitachi chip supports many more charac=
ters, and people think it's "too easy" to drive AY0438, thus they don't b=
other.
> I'm very interested in getting a sample code written using C18 compiler=
 about driving just a few digits LCD using any control chip, if someone m=
ay share it. Thanks a lot.
> _________________________________________________________________
> =D0=C2=B0=E6=CA=D6=BB=FAMSN=A3=AC=D0=C2=B9=A6=C4=DC=A3=AC=D0=C2=CC=E5=D1=
=E9=A3=A1=C2=FA=D7=E3=C4=FA=B5=C4=B6=E0=B2=CA=D0=E8=C7=F3=A3=A1
> http://mobile.msn.com.cn
> --
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> http://mailman.mit.edu/mailman/listinfo/piclist
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>



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