piclist 1997\09\17\063852a >
Thread: LCD "busy" signal
face BY : Alec Myers email (remove spam text)

>I'm currently working with a 2x16 display and I have opted to not read
>the display and simply wait the maximum time (The application is not
>time critical, so I save one IO). But just to check: You should not read
>the busy flag between the two 4 bit operations, it is only valid after
>the whole operation is completed.

Surely you *have* to read the busy flag between the two 4-bit reads?
'Busy' is bit7 which appears after the first read. After the second,
you're looking at bits 0-3.

It works OK for me like this, anyway.


See also: www.piclist.com/techref/lcds.htm?key=lcd
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