Lpc2000

I have driven a 4x20 display off an lpc2106 without any problem. 

You only need 7 GPIO lines for these: DB4-DB7, E, data/cmd, and r/w. Because you can drive these devices in 4 bit mode - That way you use less micro lines and PCB real estate.

Another useful trick is sharing the 4 data lines with a keypad driver - possible because these line are usually 
in high impedance. 

The only interfacing hardware I used between the LCD module and the 2106 were 4 pull up resistors on the data lines - but this was nencessary for the keypad circuit not the LCD. 

You've probably got a code bug.

Have fun!

Owen Mooney


 
Message: 19        
   Date: Wed, 13 Apr 2005 08:48:37 +0100 (BST)
   From: rohan patil <iamrohanpatil@...>
Subject: 
I O Port driving capacity
  i m final year student of electronics engg

 i  m trying to interface 16x2 lcd display with lpc
2106 

io ports are connected as follows

D0-P0.21.........D7-P0.28
lcd enable-p0.29    RS-p0.30
R/W is grounded

i have sucessfully implimented clear disply command
but i m not able to write data

is it the problem of driving capcity or voltage levels

please give solution.......