I was having a similar problem until I put 35 volts throught the PWM output
by accident - now I'm getting a 0% duty cycle ;-)

Experimenting will resume when I dig through my box of bits and liberate
another 16f628 from an old project.

Dom
----- Original Message -----
From: "Kyrre Aalerud" <kreature@C2I.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, June 12, 2003 1:49 AM
Subject: [PIC]: PWM on 16F62x problem?


> Well...  I ironed out the problem on the last interrupt driven problem.
It
> was a faulty PIC going into latchup over nothing.
>
> Anyway.  I have another problem.
> Because of the annoyance of setting the two LSB in the duty-cycle of the
> 16F62x PWM, and since I only needed 8 bits accuracy, I decided to use the
> upper byte and simply set the lower to 0,0.  Then quadruple the clock for
> the pwm and I can write the intended value directly to the byte.  Problem
is
> 100% duty doesn't seem to exist?  I set PR2 to 63 and CCPR1L to 255 and
> still my multimeter only registers 3.05 Volts on the pwm output?  I supply
> the circuit with about 5 Volts.
>
> My understanding is that as long as you overshoot the value of PR2 it
> doesn't matter if you don't use the lower bits.  You still get 100% duty.
> Any ideas?
>
> Oh, and yes I'm building a cheap speed-controller for my RC-plane :)
> (People should be wondering about now.)
>
>     KreAture
>
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