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'[EE]: Hitachi 44780 LCD controller -- 4bit mode pi'
2002\06\26@014948 by Erik Jacobs

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When using the Hitachi 44780 (or equivalents)... if you are using the 4-bit
mode how should you terminate the connections to the remaining pins?  The
datasheet itself makes no mention of the other pins (DB8+) so are they
simply not connected?  Once the device is "set" to bein 4-bit mode it would
then appear to become irrelevant... but what about during initialization?

-Erik

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2002\06\26@053946 by Dwayne Reid

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At 01:51 AM 6/26/02 -0400, Erik Jacobs wrote:
>When using the Hitachi 44780 (or equivalents)... if you are using the 4-bit
>mode how should you terminate the connections to the remaining pins?  The
>datasheet itself makes no mention of the other pins (DB8+) so are they
>simply not connected?  Once the device is "set" to bein 4-bit mode it would
>then appear to become irrelevant... but what about during initialization?

The data pins have internal pull-up resistors on them.  Just letting them
float seems to be OK.

dwayne

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2002\06\26@070330 by Mark J. Dulcey

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Erik Jacobs wrote:
> When using the Hitachi 44780 (or equivalents)... if you are using the 4-bit
> mode how should you terminate the connections to the remaining pins?  The
> datasheet itself makes no mention of the other pins (DB8+) so are they
> simply not connected?  Once the device is "set" to bein 4-bit mode it would
> then appear to become irrelevant... but what about during initialization?

As others have pointed out, they have internal pullups, so you don't
need to tie them anywhere. What wasn't mentioned is that, if you ever
read from the module (busy testing, for example), it's important NOT to
tie the unused lines to +5 or ground; otherwise the drivers on the
device will be fighting with the power supply.

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