Ah, you want Mike Predko's 2-wire interface ...

http://www.radanpro.com/Radan2400/mikrokontroleri/2-Wire%20PIC%20LCD%20Inte=
rface%20by%20Myke%20Predko.htm



> An LCD display connected to a PIC requires a minimum of 6 port pins.
> With small pin-count PICs, this can be a problem.
>=20
> Many years ago, when the Basic Stamp came out, some clever chap provided
> a serial LCD display - it used RS232 - to reduce the pin count (this was =
in the
> days of the 16F84).
>=20
> I want to do the same thing but using SPI. (I just want it for myself - I=
 don't
> plan on producing anything). I can always get a chip with SPI hardware to=
 use
> as the LCD driver, but I though I would try it with a couple of chips I h=
ave on
> hand, using software SPI.
>=20
> I've done SPI master in software - no problem. It seems to me that doing =
the
> slave shouldn't be difficult at all - it is really a very simple system. =
I've search
> the Internet to see if there are any software slave implementations out
> there, but no luck. Rather than re-invent the wheel, do any of you know o=
f
> any?



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