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best practices for LCD FLEX etc display in Nibble mode

 
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asmboy



Joined: 20 Nov 2007
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best practices for LCD FLEX etc display in Nibble mode
PostPosted: Tue May 12, 2009 12:17 pm     Reply with quote
any comments on best practice for dealing with
D0-3 ( unused lines ) on LCD modules when used in 4bit Nibble mode ?

Ground 'em or or let em float ? ( other ??)
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue May 12, 2009 12:29 pm     Reply with quote
Look at the schematic on the bottom of page 54 in the HD44780 data
sheet. The data bus pins have a weak pull-up on them. You don't have
to do anything with the unused pins. Leave them unconnected.
http://www.melabs.com/downloads/hd44780u.pdf
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