Frequency = Fosc / (4 * (period+1) *postscale)? (Power PWM).

nhamdtk4 · Joined: 18 May 2009 Posts: 8 Location: Việt Nam

Frequency = Fosc / (4 * (period+1) *postscale) in PIC C Help. I don't understand if i want a channel PPWM works with frequency from 10kHz - 20kHz then period and postcale = ???.

bungee- · Joined: 27 Jun 2007 Posts: 206

uC with 8Mhz internal clock and 15kHz PWM would have setting: setup_timer_2(T2_DIV_BY_1,132,1);

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

Here's an example of how to setup the Power PWM module in the 18F4431:
http://www.ccsinfo.com/forum/viewtopic.php?t=37206&start=2
By looking at the setup code, and the #use delay() frequency, and
the list of frequencies of the output signals, you should be able to
verify how the PWM frequency is calculated.