I haven't tried this myself, but I will be doing trying it in a few
days, if I get the time.  If this works, you'll only need an inverter
and 2 open collector [N]AND gates.  You'll be able to better see the
following bad attempt at ASCII art with a monospace type font (i.e.
courier new)
                 |---
SPI CLK   -------|    \
                 |    |---------- SPI CLK
            +----|    |
            |    |---/
            /\
           /  \ inverter
           ----
            |    |---
I/O PIN   --+----|    \
                 |    |---------- I2C CLK
I2C CLK   -------|    |
                 |---/


If this does work, seting/reseting the i/o pin determines which clock is
active at the time of your transfer.

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.

Good luck.


-Mario


-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
Of Paul van der Linden
Sent: Saturday, July 02, 2005 10:35 AM
To: Microcontroller discussion list - Public.
Subject: [PIC] Multi SPI and I2C


Hi,
I'm trying to design a board while waiting for the ethernet chip to 
become available.
The problem is the device are using SPI and I2C, how to connect this to 
a single PIC, and which PIC do you recommend (18F with enhance flash is 
preferable)?
The problem is, I can only solder normal PDIP packages, no SMD parts.

The following things must be connected to the PIC:
- 1-8 x memory: 24FC512 (through I2C)
- 1 x digital potentiometer: MCP42010 (through SPI)
- 1 x ethernet: ENC28J60 (through SPI)
- and there must still be enough I/O lines to connected a LCD display 
(datasheet: http://www.lcdchina.com/PDF/GDM1602A-5.pdf)

Paul

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