It could be possible, I didn't knew that the LCD's have internal pull-ups for those lines. Lucian -----Original Message----- From: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Dwayne Reid Sent: 12 mai 2004 23:09 To: PICLIST@MITVMA.MIT.EDU Subject: Re: [PIC:] LCD Sometimes Displaying Unwanted Characters At 01:54 PM 5/12/2004, Lucian wrote: >Looking at the schematic, I see now that all the data lines have >pull-down resistors, as they are shared with the columns of a 4 x 5 >keypad. What is weird is that the LCD sometimes displayed the clock in a >wrong position although there was no key activity, so I am inclined to >think that the problem does not come from here. Any chance that the *pull-up* resistors in the LCD are fighting the pull-down resistors you mention above and causing problems? Just idly musing - I haven't had a chance to look at the schematic and I could be way off base. dwayne -- Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax Celebrating 20 years of Engineering Innovation (1984 - 2004) .-. .-. .-. .-. .-. .-. .-. .-. .-. .- `-' `-' `-' `-' `-' `-' `-' `-' `-' Do NOT send unsolicited commercial email to this email address. This message neither grants consent to receive unsolicited commercial email nor is intended to solicit commercial email. -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics