Jinx, when you say reset, do you mean ---, well, what do you mean?  What
reset key?

Omer YALHI
oyalhi@teksan.com.tr
http://www.teksan.com.tr
Tel : +90 212 613 22 00
Fax: +90 212 544 70 35


-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Jinx
Sent: Friday, August 16, 2002 2:47 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]: LCD Contrast Variation


> If all communication timing are ok then only Vlc must modify the
> contrast

Two jobs ago the LCD I used had Vlc tied to 0V. I snipped the LCD
routines from a previous project (which worked fine) and included them
into the new one. The LCD contrast would not initialise until I pressed
the reset key. On power-up the background to the chars on the LCD was
very dark, and cleared only after a reset. Before I got to figure out
what was wrong I needed to change the xtal from 4MHz to 16MHz. After the
init timing was amended to suit 16MHz it worked perfectly. So the
conclusion is.........s/w or h/w problem on the original ??? A bit of
both ??? The routines came from a 4MHz program which should have not
misbehaved in another 4MHz PIC

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