That
is a really strange reference design and I hadn't see that one before, it
doesn't make any sense to tie D7 to ground. All of the other 1-Wire designs I
have seen are 4 bit, including AAGs and the one in the data sheet for the
DS2408. Since there are only 8 I/O lines and RSTZ on the DS2408 you can't
use an 8 bit interface to the LCD because with the strobe line and the DATA/CMD
line it takes 10 I/O lines for an 8 bit interface.
The main difference is that our (Hobby Boards) design uses a
different pinout between the DS2408 and the LCD.
Eric
-----Original Message-----There a two published designs.
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Paul Alfille
Sent: Thursday, August 03, 2006 6:59 PM
To: owfs-developers@lists.sourceforge.net
Subject: Re: [Owfs-developers] LCD control with DS2408
The Maxim/AAG design is 8 bit.
The Hobby Boards is 4 bit.
The commands are prefixed H and M.
Paul Alfille
On 8/3/06, Jan Kandziora <[EMAIL PROTECTED]> wrote:Dear all,
for my project, a Onewire controlled HD44780 display would come in handy. I
see owfs supports the reference design from
http://www.maxim-ic.com/appnotes.cfm/appnote_number/3286
As the D7 line is tied to GND in that schematic, it's not possible to use all
the characters (and commands) in the 44780's ROM in 8 Bit mode. That brings
up my question:
Does owfs use the 8 Bit mode of the 44780 in that design, or the 4 Bit mode?
Kind regards
Jan
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