if its an rc servo then  what they are saying is  centre is 1.5ms width
ccw and cw extremes are .9 and 2 ms  respectively
and you see a pulse every 20 ms  ie pwm



  At 11:25 PM 7/17/03 -0400, you wrote:

>I'm trying to control a servo using timer2 and interrupts. The servo's
>docs say:
>
>"... require 3-5V peak to peak square wave pulse. Pulse duration is from
>.9mS to 2.1mS with 1.5mS as center. The pulse refreshes at 50Hz (20mS)"
>
>First, what do they mean by "the pulse refreshes at 50Hz"?
>
>Second, I am assuming I want a 50% duty cycle?
>
>Third, When I eventually want to change the wave, do I simply adjust PR2
>or do I have to change CCPR1L:CCP1CON<5:4>, as well?
>
>I apologize if this is too mundane, but I'm very new at this.
>
>--
>http://www.piclist.com hint: The list server can filter out subtopics
>(like ads or off topics) for you. See http://www.piclist.com/#topics
>
>
>---
>Incoming mail is certified Virus Free.
>Checked by AVG anti-virus system (http://www.grisoft.com).
>Version: 6.0.491 / Virus Database: 290 - Release Date: 6/18/03

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics