Look at the Compare Module.
It's not strictly hardware by at 50 Hz who cares?

On 8 Jun 2002 at 17:41, Andy Shaw wrote:

> Hi,
> What is the lowest frequency you can get using the PWM module (on say an
> 16F877 with 4MHz xtal)? From looking at the docs it seems to me it is
> 1000000/16/256  which is approx 244Hz. Is this correct I've been thinking of
> using the PWM module to generate a standard R/C servo control pulse but this
> has a frequency of 50Hz. I've not really used the PWM module before so just
> exploring options at the moment. Failing this any other ways of using the
> hardware to generate the pulse train. I've used the CCP module to do it but
> that still involves code to start the process off every 20ms or so.
>
> Thanks
>
> Andy
>
> --
> http://www.piclist.com hint: The PICList is archived three different
> ways.  See http://www.piclist.com/#archives for details.
>
>


  *
  |  __O    Thomas C. Sefranek  tcs@cmcorp.com
  |_-\<,_   Amateur Radio Operator: WA1RHP
  (*)/ (*)  Bicycle mobile on 145.41, 448.625 MHz

ARRL Instructor, Technical Specialist, VE Contact.
http://hamradio.cmcorp.com/inventory/Inventory.html
http://www.harvardrepeater.org

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.