Hi Adrian.

First and Principal : Thanks for your material.

Your description and draw of the module are the correct.

You«re right, the modules EPSON are 1x20. Please send me the sample 8051
code, because I never drive a LCD module like this, the only that I«ve used
is the traditional 14-PINs with 8 data lines, Enable, R/W, RS.(I don«t know
how to drive a LCD module with clock input, and I don«t know the functions
of the pins: /CS; A0; /WR; /RD.

Thank You, Adrian.



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> From: Adrian Godwin <adrian@FANGORN.DEMON.CO.UK>
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: EPSON EA-C20017AR LCD [OT]
> Date: Domingo 25 de Enero de 1998 15:07
> 
> Sebastian Garcia <sgarcia@TRON.FI.UBA.AR> wrote :
> 
> > I need general information about particular LCD modules (1x16) that got
> > only 12 wires (total).
> 
> > The modules I got are the EPSON model: EA - C20017AR - S   (I've
rescued
> > them from old Siemens pseudo-digital phones model T16 D)
> 
> I got a similar display very cheaply from a surplus dealer a few
> months ago. (Fir UK readers who might be interested - it was 'Taurus'
> at Leicester radio rally) It looked useful, because it's much smaller
> than typical LCDs - only 22mm (7/8") tall, but I couldn't find any
> data on it, and it took a while to get it working. Note that it's
> actually 1x20, not 1x16.
> 
> 
> Mine's actually EA-C20017AR. I don't know what the 'S' that yours has
> means. It has an epoxy blob covering the controller, a couple of
> surface-mount discrete components, and a 2x6 array of pads to connect
> the host. Some of the pads (1,2,11,12) are numbered, in a VERY tiny
> font, on the back of the module.  Here's a diagram : make sure your
> mail client is set to use a fixed-width font.
> 
> 
>     (back of pcb, lettering right-way-up)
>  +---------------------------------------------------------------+
>  |                                                       2    1  |
>  |  EPSON              EPSON                             o    o  |
>  | P300011700      EA-C20017AR      epoxy          C     o    o  |
>  |                     8822B8       blob                 o    o  |
>  |                                                 R     o    o  |
>  |                                                       o    o  |
>  |                                                       o    o  |
>  |                                                      12   11  |
>  + --------------------------------------------------------------+
> 
> The resistor is used for the oscillator
> 
> Most simple dot-matrix character displays use a controller based on
> the Hitach 44780 - this one uses the Seiko-Epson SED-1200, which is
> quite different. There are data sheets for a SED1200F controller on
> Seiko's website, but they don't describe it's use in the EA series
> LCDs.
> 
> The pads 1-12 correspond to the following SED-1200 pins :
> 
> 1       Vdd             +5v
> 2       Vss             0v
> 3       Vlcd            (Vdd-4 to Vdd-5.5)
> 4       Clock           Max 3.2MHz
> 5       /CS
> 6       A0
> 7       /WR
> 8       /RD
> 9       D3
> 10      D2
> 11      D1
> 12      D0
> 
> Note the requirement for a clock, unlike the 44780 : 1 - 3MHz seems to
> be recommended, slower for low power and faster for higher command
> execution speed.
> 
> I won't describe all the programming here (though I can send you some
> sample 8051 code that performs simple operations)- it's along the
> same lines as the 44780, though the actual commands are different,
> so read the data sheet. As with the small 44780-based modules, it's
> necessary to initialise it as a 2-line display. I used the commands
> 0x10, 0x10, 0x13, 0x0d, 0x80, 0x04, 0x0e to initialise it with the
> cursor invisible.
> 
> 
> > Also I need general information about the way to drive big LCD modules
with
> > only 8 wires, like the Samsung model:  UG - 24B09 - GNBR9 - A950512ME.
> 
> Sorry. Don't know anything about these.
> 
> -adrian