A question about PWM

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alm7100
Posts: 85
Joined: 09 Oct 2008 11:58
Location: Denmark

A question about PWM

#1 Post by alm7100 » 18 Jun 2009 20:33

Hi

I Have a question about PWM (I dont understand PWM total)

procedure PWM1_Init(freq : longint);

If i have a Pic at 40MHz.

Can that pic then have a PWM freq between 0 and 40MHz ??

//
Allan
//
Allan (Sorry for my English.)
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alm7100
Posts: 85
Joined: 09 Oct 2008 11:58
Location: Denmark

#2 Post by alm7100 » 25 Jun 2009 21:44

Thanks for all the answerer. :-)
//
Allan (Sorry for my English.)
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piort
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#3 Post by piort » 26 Jun 2009 14:41

hi allan,

you dont tell us wich pic you use ... but basically you can find that information in the datasheet of the Pic you are using. section ccp/pwm.

exemple for a 18f2510 the formula is :
PWM Period = [(PR2) + 1] • 4 • TOSC • (TMR2 Prescale Value)

PWM frequency is defined as 1/[PWM period].

hth a bit ;-)
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