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PIC16F88 - PWM resolution problem
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Ttelmah



Joined: 11 Mar 2010
Posts: 19252

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PostPosted: Wed Apr 06, 2011 9:32 am     Reply with quote
Value can't be bigger than the ((middle value+1) *4)-1.
So for a middle value of 255, maximum value is 256*4 = 1024 -1 = 1023. The '10 bit' maximum for the chip.
Your formula is basically right, except for needing a division by 100.

value = (%/100) *(250+1) *4 -1

100% = 1003
50% = 501

You've lost a '0' in your 100% calculation.

Best Wishes
luismramirez



Joined: 17 Feb 2011
Posts: 8

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PostPosted: Wed Apr 06, 2011 11:47 am     Reply with quote
Thank you!

However, your formula has a "-1" at the end.
The one at the first page doesn't.

Which one is right and why??
luismramirez



Joined: 17 Feb 2011
Posts: 8

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PostPosted: Wed Apr 06, 2011 6:35 pm     Reply with quote
ok. i got it.

thank you all ;)
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