Along the same lines, you can use the I2C bus to drive the lcd and save
the i/o pins altogether.  Go to microchip.com, get a sample of an i2c io
epander such as the mcp23016 and use that to drive the lcd =).  I have
one of those arriving soon although I'll be using it for something else.


-Mario

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
Of Maarten Hofman
Sent: Saturday, July 02, 2005 11:16 PM
To: Microcontroller discussion list - Public.
Subject: Re: [PIC] Multi SPI and I2C


> In case you're running low on i/o pins, you have the option of driving

> your lcd serially with the following 
> http://www.allelectronics.com/spec/EDE-702.pdf which is actually a pic

> preprogrammed so that you can drive an lcd with just one i/o pin.

If you have two pins, you could use the 2-pin interface from Myke
Predko's page (http://www.myke.com/lcd.htm). I personally prefer the
3-pin interface from that same page, it is very simple with a cheap
($0.39) 74HC164, and the output of the shift register can be used to
control other devices as well. The EDE702 seems rather expensive to save
only 1-2 pins. Depending on your application, the 2-pin or 3-pin
interface could even be faster than the EDE702 solution.

Greetings,
Maarten Hofman.

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