8mhz internal osc and 455khz

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  1. - 19th December 2007, 15:13 #1
    Acetronics2's Avatar
    Acetronics2
    Acetronics2 is offline Fanatical Contributor
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    Default Bingo !

    Hi, Michael

    Steve's PWM calculator will confirm you an exact 455 Khz @ 50 % duty cycle with 7.28 Mhz clock ...

    http://www.mister-e.org/pages/utilitiespag.html

    Cheers !

    Alain
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  2. - 19th December 2007, 19:12 #2
    Michael Wakileh's Avatar
    Michael Wakileh
    Michael Wakileh is offline Junior Member
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    Thanks!

    And here some help for others on how its solved:


    Mister E's multi-calc outputs the following for the 8MHz oscillator when we want a 455khz pwm:

    500,0 KHz prescaler1:1 PR2=3 6 Bit resolution

    we want the pwm to be a bit slower so:

    455/500= 0.91

    0.91x8MHz = 7,28MHz
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