On a sunny day (Thu, 16 Nov 2006 02:46:07 +0000) it happened Eeyore
wrote in
:



Don Lancaster wrote:

Don Lancaster wrote:

Also in general, if your system does not use a crystal frequency of
32.768 kHz or 3.59545 MHz, you should flush it and start over.


Oops.

Should be 3.579545 of course.

What's wrong with 4.433618 MHz ?

Graham

In fact most analog PAL TVs will have a 8.86 MHz xtal.
Makes it easier to get 90 degrees.
As for the OP remark, makes no sense.
If you want a one second tick, and for example have a FPGA on board,
it is one line of verilog from a 50MHz xtal.
Not much more lines of ASM in a PIC with a 20 MHz xtal.
Depending on how much jitter is allowed you can make a nice synthesiser
too in FPGA for many frequencies (higher the xtal too).
And finally the color subcarrier... will likely not be needed much longer,
its is all going digital, or at least Y Cr Cb, not composite.