Glenn M�ller-Holst wrote:
> silusilusilu@gmail.com wrote:
>> I want to implement a monochromatic graphic display with an 8 bit
>> micro....this display requires clock frequency of 10MHz max, and my
>> micro is used at 16MHz...Is impossible to drive this display without
>> any controller?What do you think?
>> Thanks
> 
> 

By the way - the technique is called bit-banging and is a quite common 
in smaller embedded systems:

http://en.wikipedia.org/wiki/Bit-banging

It can be used to generate and interpret many forms of signals. The best 
in terms of power and to minimize mips is to use a dedicated hardware 
subsystem.

Glenn

On Apr 1, 11:25=A0pm, silusilus...@gmail.com wrote:
> I want to implement a monochromatic graphic display with an 8 bit
> micro....this display requires clock frequency of 10MHz max, and my
> micro is used at 16MHz...Is impossible to drive this display without
> any controller?What do you think?
> Thanks

Yes, most LCD panel accepts 1 bit or 4 bits data stream.  But you need
a big video buffer (16K to 32K Sram) and logic to serialize it at a
constant rate.

silusilusilu@gmail.com wrote:
> I want to implement a monochromatic graphic display with an 8 bit
> micro....this display requires clock frequency of 10MHz max, and my
> micro is used at 16MHz...Is impossible to drive this display without
> any controller?What do you think?
> Thanks


Hi!

Here are some examples:

Howto on generating video signals using PIC. (Written by me):
http://www.rickard.gunee.com/projects/video/pic/howto.php

VIDEO TETRIS:
A video game with software generated video signal !
http://www.rickard.gunee.com/projects/video/pic/tetris.php
http://www.web-ee.com/Schematics/PICTetris/PICTetris.htm
http://www.rickard.gunee.com/projects/video/pic/tetris.php

PIC Breakout:
http://www.acm.uiuc.edu/sigarch/projects/breakout/
http://www.acm.uiuc.edu/sigarch/projects/breakout/breakout.asm

PIC-Tock:
http://www.brouhaha.com/~eric/pic/pictock.html

PIC-Pong:
http://www.brouhaha.com/~eric/pic/picpong.html

VCR Pong:
http://dt.prohosting.com/pic/pong.html

Alien Slaughter!
A Video Game Computer based on 3 Microcontrollers:
http://www.ugrad.physics.mcgill.ca/~beek/alienslaughter/

Video Clock Superimposer:
http://dt.prohosting.com/pic/vidclock.html
http://dt.prohosting.com/pic/vid_src.txt
http://dt.prohosting.com/pic/vidclock.gif

Glenn

silusilusilu@gmail.com wrote:
> I want to implement a monochromatic graphic display with an 8 bit
> micro....this display requires clock frequency of 10MHz max, and my
> micro is used at 16MHz...Is impossible to drive this display without
> any controller?What do you think?
> Thanks
If you think of an LCD glass like a CRT, then can you display on a CRT 
without a controller ?

Yes you can, but it will require timing signals to be constantly driven 
but the microprocessor.

Same problem with LCD glass, someone has got to do it, its usually easer 
to do it with a controller.

good luck

don

silusilusilu@gmail.com wrote:
> I want to implement a monochromatic graphic display with an 8 bit
> micro....this display requires clock frequency of 10MHz max, and my
> micro is used at 16MHz...Is impossible to drive this display without
> any controller?

Pretty much so, yes.  For starters, a CPU running off a single 16 MHz 
clock can't even generate a 10 MHz clock signal, much less output 
controllable data at that rate.

You don't necessarily need a specialized LCD controller, but you will 
need some device that the CPU can offload the LCD data refresh to. 
Either that, or a *much* faster CPU.

I want to implement a monochromatic graphic display with an 8 bit
micro....this display requires clock frequency of 10MHz max, and my
micro is used at 16MHz...Is impossible to drive this display without
any controller?What do you think?
Thanks