Swapping LCD panels

[Peter Ullrich]

>Does anyone know if there is a problem running two LCD panels from a
>port intended for only one?  The K2000 LCD connector is easily accessible
>and I have been meaning to try using two at one time but, as stated
>earlier, there is a r/w line that indicates the LCD sends data back
>to the master controller at times.  This would prevent the use of two
>if the function is used.  Is it normally used?  How much interaction
>actually goes on?

Hi !

Yes this might be a problem because of the software-interface for the lcd.
As the LCD is very slow compared with microcontrollers, the microcontroller
has to check if the lcd is still busy and this has to be done by reading the
status byte. If you connect two displays it is possible that one display is
ready but the other is still busy. If the microcontroller sends data at this
moment, only the ready display will get these data...

I hope that helps
Ciao
Peter

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                   Ing. Peter Ullrich      mailto: ullrich at kapsch.co.at
                   http://www.geocities.com/SiliconValley/Heights/3586/
                   Hardware & Software Developer /  Electronic Musician
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