TV output on low-cost portable computers

[Eugen Leitl]

On Sun, Mar 12, 2006 at 03:36:18AM +0100, Dave Long wrote:
> >A normal NTSC frame contains 525 lines, of which 485 are active.  If
> >you were to display 640x480 pixels, you'd need to emit a pixel 640
> >times in 52 microseconds, or once every 81 nanoseconds --- a dot clock
> >of about 12 MHz.  A microcontroller clocked at 20MHz would have a hard
> >time keeping up with this; perhaps the 70MHz LPC2101 ($1.75 in
> >quantity from Digi-Key) could cope, but it doesn't have enough RAM for
> >a framebuffer, barely enough for an 80x24 character generator.

Notice that MuP21 managed to do video output with only 7 kTransistors.

-- 
Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org
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