TV output on low-cost portable computers
eugen at leitl.org
Mon Mar 13 05:46:02 EST 2006
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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