>>> stoney <stoney@OSWEGO.NET> 17/July/1997 02:04pm >>>
>hello pic guys
>        has any body tried to generate music using a pic 16c54 or55
>any suggestions are appreciated
>mike johnston

    The note A below middle C is defined as 220 Hz

    Every semitone up, multiply by the factor k = twelth root of 2.
    Every semitone down, divide by k.

    e.g. middle C = 220*k*k*k Hz

    Use Microsoft Excel to do the following...

    1.   Convert the required frequence @ notes, into period,
         T = 1/f.
    2.   Calculate corresponding timer reload values for the reload
         timer and clock divisor.

    Usually an octave fits nicely into one clock divisor value,
    as an octave up/down corresponds to the frequency
    doubling/halving.

    Attached are C routines written for Hitachi's H8/300L 8-bit
    and H8/300H 16-bit microcontroller, not guaranteed to work
    with the PIC.

    The musical score strings are fully Microsoft QuickBasic
    "play" command compatible with some enhancements.

Regards,

Peter Tiang
Design Engineer
tiangcfoon@hitachi.com.my



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