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12F1840 PWM

 
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BLL



Joined: 11 Nov 2006
Posts: 181
Location: Birmingham, UK

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12F1840 PWM
PostPosted: Sat Mar 23, 2019 9:54 am     Reply with quote
Hi, I am trying to use PWM for the first time and am getting bogged down in the formulae and can't see the wood for the trees!
I am using the internal oscillator at 4MHz - #use delay(internal=4M)
I want a 100kHz signal with duty cycle variable from 0 - 100%
I don't understand the calculation to get the right values for setup_timer_2.
Also, the datasheet has an equation for pulse width and for duty cycle ratio, which I don't follow either!

Can anyone please offer a SIMPLE explanation I can follow?

Thanks

Brian
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Mar 23, 2019 9:56 am     Reply with quote
Links to forum articles on pwm:
http://www.ccsinfo.com/forum/viewtopic.php?t=45968&start=1
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