[sdiy] Multiple LCD connection sanity check please

[ASSI]

On Tuesday 11 January 2011, Tom Wiltshire wrote:
> Hi all,
> 
> If I were connecting several LCDs to a single microprocessor, would I be
> able to do the following?:
> 
> Tie all the LCD R/W pins to 'Write' (I'm not interested in reading from
> the displays). This will put the data pins into Hi-Z mode and let me..
> ..Parallel all the LCD data ports together (I'm using an 8-bit
> interface). Use the individual 'Enable' pins on each display to select
> which LCD responds to messages sent to the display bus

I think you could if the uC can drive the lines.  Any reason why you 
couldn't use I²C (bus) or SPI (daisy-chain) serial LCD, they are designed to 
do that and tie up much less pins?  If parallel is already decided than I'd 
personally feel better having a bus multiplexer between the uC and each LCD.


Achim.
-- 
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