Hello again with another question on a different topic...

I have an LCD 2x16 module driven by a PIC16F648A in 4 bit mode. It
initialises ok, displays normally, but sometimes it displays the
characters at unwanted screen locations or displays unwanted characters.
I had a clock with blinking ":" displayed, but sometimes the time was
displayed at the first row instead of the second.
I have a menu displayed but sometimes it displays unwanted characters
instead of the correct ones, I observed that often with one character
ahead, e.g. "MEMU" instead of "MENU".
I searched all the web, but only found a post for PIC Basic (I am using
Hi-Tech PIC C) that was saying that it might be the interrupt service
routine which doesn't save all the context before jumping to the
interrupt so that sometimes the LCD routines are interrupted and don't
execute correctly. I cannot disable the interrupts in the LCD routines
as I have some timers and serial communication.
I am sure that you know more than me on this issue. Could you please
help ?

Lucian

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Ken Pergola
Sent: 11 mai 2004 23:28
To: PICLIST@MITVMA.MIT.EDU
Subject: [PIC:] Microchip PICmicro videos

This link was posted in the Microchip Forums and I thought it would be
worth
posted it here:

http://techtrain.microchip.com/x14/


You'll find some professional videos related to PICmicro topics.

Beginner or advanced, these might be worth your time. I only looked at
one
so far, but what I saw was very nice and professional.



PICmicro x14 Basic Training Modules

The following modules are available to help you familiarize yourself
with
the PICmicro MCU. Each module is an animated movie with audio.

There is no installation necessary. Simply download the zip file to your
hard drive and unzip the files. Each course should be copied to a unique
folder.


PICmicro x14
------------
Architecture               (12.8MB)
Instruction Set            (12.6MB)
Device Configuration       (4.0MB)
Resets                     (4.5MB)
Oscillator download        (2.9MB)
Development Tools Overview (13.3MB)



Best regards,

Ken Pergola

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