piclist 1997\09\17\024529a >
Thread: LCD "busy" signal
face BY : Fowler, Gary email (remove spam text)

part 0 1334 bytes

I had the same problem with one of my projects some time ago. The circuit  
was working fine with one type of LCD but wouldn't with another type.  
When trying to locate the fault I discovered it started working when I  
would touch the busy flag pin (DB7) with either a CRO lead or my finger.  
I think I put in a pull-up or pull-down resistor and it worked, but as I  
was going to use the original LCD in the end this was removed. I was  
using the 4-bit interface.
I haven't had time to go back and have another look at it. Keep us posted  
to any developments.


Email: TakeThisOuTGary.FowlerspamEraseMEdsto.defence.gov.au
Phone: +61 8 8259 5767  Fax: +61 8 8259 5672
Defence Science & Technology Organisation
PO Box 1500, Salisbury, South Australia 5108

Date:    Tue, 16 Sep 1997 11:29:49 -0700
From:    Ed VanderPloeg <spam_OUTevanderploeg@spam@spamCREO.COM>
Subject: [OT] LCD "busy" signal

I'm trying to use a PIC to drive a standard, run-of-the-mill, LCD  
and am having trouble understanding the operation of the "busy flag".


For efficiency I'm trying to wait for the busy signal as described in the
databook but it's not working as expected.  Seems like the LCD is forever


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