HPWM at very low frequency

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  1. - 23rd December 2010, 09:02 #1
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    This has the ADC turned off.
    ANSEL = 0
    Try
    ANSEL = %00001000
    Dave
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  2. - 23rd December 2010, 09:13 #2
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    Hi, Dave

    did you notice the generator will only output 489 to 512 Hz ???

    ... RTFM ???

    Yes Ken, you should read your manual, HPWM section ( or the Pic Datasheet ! )

    Alain
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  3. - 23rd December 2010, 09:24 #3
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    did you notice the generator will only output 489 to 512 Hz ???
    Yup, and the OP said it was going from 500 to... So that part sounds about right. Does he want something slower?
    Dave
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  4. - 23rd December 2010, 12:24 #4
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    Argrr, ya, I read the text but I skipped the table, But I need lower frequency then 489Hz, Actually I need between 10 to 300Hz, I think I am better off with what I am using now, a 555 timer.

    K
  5. - 23rd December 2010, 12:41 #5
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    Quote Originally Posted by lerameur View Post
    Argrr, ya, I read the text but I skipped the table, But I need lower frequency then 489Hz, Actually I need between 10 to 300Hz, I think I am better off with what I am using now, a 555 timer.

    K
    you can use a PIC, but with " soft " PWM generation ...

    Also have a look to what the CCP module can do for you ... more than generating PWM.

    in Compare mode, for example ... you easily can reach 2Hz ...

    a Timer1 Overflow interrupt also will work fine ...

    Alain
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    Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
    ************************************************** ***********************
    IF there is the word "Problem" in your question ...
    certainly the answer is " RTFM " or " RTFDataSheet " !!!
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  6. - 9th May 2013, 08:41 #6
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    Default Re: HPWM at very low frequency

    HI,
    I read page 83 concerning compare mode... still have no idea how you could get 2hz .
    The manual says even in PWM mode we cant get lower then 5ms long witch is about 200hz...

    K
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