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Software pwm more explanation please

 
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atlantis



Joined: 14 Mar 2007
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Software pwm more explanation please
PostPosted: Thu Mar 15, 2007 2:54 pm     Reply with quote
Can somebody please explain how I set the software pwm code in the following post to generate a certain frequency?

http://www.ccsinfo.com/forum/viewtopic.php?t=20050

As it is it generates 100Hz, now I need it to generate frequencies between 67 and 1750Hz.

Regards
Martin
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Mar 16, 2007 11:38 am     Reply with quote
You can change the frequency by changing the LOOPCNT value,
and also the RTCC_DIV_x value.

If the width value = LOOPCNT, then you have 100% duty cycle.
So when you reduce the LOOPCNT value to increase the PWM
frequency, your resolution (number of available steps) will go down.
That's the trade-off.
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