CRT controller(?)

Archiver

Hi all,

I've got two Toshiba TLC-271A rasterscan LCD displays for which I hope to
find a 'simple' interface.
These LCD's are 3 1/4" x 10" in size, 480x128 dots (or 80x16 chars) and they
are controlled by
four signals:

Clock (typical clockperiod 0.25 microseconds)
Data (new pixelvalue on/off outputted on each clockpulse)
Horizontal sync (typical period 250 microseconds, 244 us high, 6 us low)
Vertical sync (typical period 16 milliseconds, 0.25 ms low, 15.75 ms high)

I know the stamp can't handle that clockrate, but perhaps anybody knows of a
microcontroller(?)
that I could place between the stamp and the LCD.
I got a schematic build around a MC6845 CRT controller but I find that too
complex.

I ran a little testprogram using four datalines from the PC parallel port
and did manage to get some
picture. What I got was a moving black dot across the screen. Obviously the
clockrate output of
my program was far too low, but it showed me that the LCD's do function.

What I had in mind was to store the LCD bitmap in a 8K ram, and let a
microcontroller
generate the four required signals.

Anybody any suggestions?

Thanks.
Greetings peter

Archiver

I may be biased :-), but this sounds like something that a Ubicom SX or
IP2022 would be good at. Have a look at:

http://www.brouhaha.com/~eric/ubicom/servid/

to see what is possible.

Regards,

Chris.

>

---

Original Message

---

> From: Peter Verkaik [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=nEpsZIjoDQ47sbD3bMQcmYKD9Gf7WE4BooympT3jYXbuFxXz5T1s4yxeLmCYOnCeFtOiWsd4DtmoCxqaM-ilQjw]peterverkaik@b...[/url
> Sent: Thursday, July 12, 2001 11:32 AM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] CRT controller(?)
>
>
> Hi all,
>
> I've got two Toshiba TLC-271A rasterscan LCD displays for
> which I hope to
> find a 'simple' interface.
> These LCD's are 3 1/4" x 10" in size, 480x128 dots (or 80x16
> chars) and they
> are controlled by
> four signals:
>
> Clock (typical clockperiod 0.25 microseconds)
> Data (new pixelvalue on/off outputted on each clockpulse)
> Horizontal sync (typical period 250 microseconds, 244 us
> high, 6 us low)
> Vertical sync (typical period 16 milliseconds, 0.25 ms low,
> 15.75 ms high)
>
> I know the stamp can't handle that clockrate, but perhaps
> anybody knows of a
> microcontroller(?)
> that I could place between the stamp and the LCD.
> I got a schematic build around a MC6845 CRT controller but I
> find that too
> complex.
>
> I ran a little testprogram using four datalines from the PC
> parallel port
> and did manage to get some
> picture. What I got was a moving black dot across the screen.
> Obviously the
> clockrate output of
> my program was far too low, but it showed me that the LCD's
> do function.
>
> What I had in mind was to store the LCD bitmap in a 8K ram, and let a
> microcontroller
> generate the four required signals.
>
> Anybody any suggestions?
>
> Thanks.
> Greetings peter
>
>
>
>
>
>
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>

Archiver

Well the fastest MCU I know is the SX, take a look at the parallax website.


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