> 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?

BTW, how do you mean buggy ? Regardless, any standard 8-bit
interface is easy to modify for 4-bit, and you shouldn't have to look
too hard to find working 4-bit or 8-bit code

http://www.piclist.com/techref/io/lcd/pic.htm

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