Hi Tony,

        I use them in 4-bit mode quite often. Here is my initialization
routine, copied from comments. I figured you probably have code
to talk to an LCD already. Notice the first four data are nybbles
only. e.g. you send only 4 bits. Then you start sending 8 bits,
4bits at a time. This code works for me. If using the busy flag,
it does not become valid until the interface has been set to 4
bits (the fifth command 0x28)

;  - wait at least 15ms after Vdd > 4.5V
;  - Send 0x3, wait 5ms
;  - Send 0x3 again, wait 160us
;  - Send 0x3 yet again, wait 160us
;  - Send 0x2 to get 4 bit interface
;  - Send 0x28 (4 bit interface, 2 lines, 5x7 font), wait 160us
;  - Send 0x08 (display off, cursor off, blink off), wait 160us
;  - Send 0x01 (clear display and return to home position), wait 5ms
;  - Send 0x06 (auto-increment cursor, no shift display), wait 160us
;  - Send 0x0C (display on, cursor off, blink off), wait 160us

-----Original Message-----
From: Tony Nixon [mailto:Tony.Nixon@ENG.MONASH.EDU.AU]
Sent: Monday, October 02, 2000 2:08 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: [EE]: 4 bit LCD


Hi all,

Are there any tricks to getting an LCD to work in 4 bit mode?

All I seem to get is garbage on the display.

--
Best regards

Tony

ICmicro's
http://www.picnpoke.com
mailto:sales@picnpoke.com

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
use mailto:listserv@mitvma.mit.edu?body=SET%20PICList%20DIGEST

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
use mailto:listserv@mitvma.mit.edu?body=SET%20PICList%20DIGEST