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pic 18f4520 PWM modulation

 
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Bonzo



Joined: 10 Apr 2013
Posts: 1

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pic 18f4520 PWM modulation
PostPosted: Wed Apr 10, 2013 11:54 pm     Reply with quote
I'm kind of new to C compiler, I'm required to make a 40 kHz pwm modulation using timer2 with a 4 Mhz oscillator on a pic 18f4520.
I tried calculating PR2 and got PR2=24 (not sure about it though).
Any help is greatly appreciated.
Thanks in advance.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Apr 11, 2013 12:46 am     Reply with quote
Search the forum archives. Here's the search page:
http://www.ccsinfo.com/forum/search.php
There's also a link for it at the top of the forum.

Search for this:
Quote:
pwm 40*KHz

The reason for the asterisk is that some people might write 40KHz
and some might write 40 KHz.

Make sure you set it to search for: "Search for all terms"
Mike Walne



Joined: 19 Feb 2004
Posts: 1785
Location: Boston Spa UK

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PostPosted: Thu Apr 11, 2013 8:52 am     Reply with quote
Microchip data sheet shows exactly how to do the calculation.

CCS manual shows same thing as setup_timer_2(x,y,z) in CCS format.

Mike
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