> Microchip App notes 582 and 587 have code for driving LCDs
> using the 4-bit mode, but they are buggy.  Is there an app note
> that works with the 4-bit mode?

Try Microchip TB028. I use it in a routine that returns day name
from minute-of-the-year

http://ww1.microchip.com/downloads/en/AppNotes/91028a.pdf

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