Keith wrote:
> The 12F683, does look a lot better and I could run it at 20 Mhz

Yes, but then you need an external oscillator which will eat a pin or two.
The 12F683 does have a 8MHz internal oscillator as apposed to the 4MHz of
the 12F629, so you get 2x right there.  Also since you can use a hardware
PWM generator the PWM resolution and speed can be a lot higher at the same
clock rate.

> Hmmm, that would be a lot better to capture that 5k input frequency...

You might still be better off capturing pulses over fixed time periods, then
low pass filtering a bit to reduce jitter.  How fast does the output need to
be updated?

> BTW, Microchip does not list PWM capabilities for the 12F683, is the
> website wrong?

If in doubt, always check the data sheet.  I just looked in the
January-March 2006 line card (now known as Selector Guide) and it shows the
12F683 as having a CCP module.


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