If this is for a learning expierence, and one 12f629 is good, why not use 
two pic's.  One for input stuff and the other for output?

Bill

----- Original Message ----- 
From: "Olin Lathrop" <olin_piclist@embedinc.com>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Thursday, January 05, 2006 9:31 AM
Subject: Re: [PIC] Am I crazy? PWM on a 12f629


> 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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