Hi,

> Hi everyone,
>         I'm trying to find some code for a frequency genetator using a PIC.
> 0Hz to 10khz    0.5Hz or 1Hz increments.
> I have been experiementing with PIC16C84, dividing a known frequency
> from the TRM0 Interupt, but dividing freqencies will not give me the
> freqency increments I need.
> eg 1MHz/100 = 10kHz
>    1MHz/101 = 9900.9Hz
>
>    1MHz/1,000,000 = 1Hz
>    1MHz/1,000,001 =0.9999999
>
> Any help will be greatly appretiated
>
I designed a 1-10KHz frequency generator with a 1Hz resolution about a
year ago.  I used a numerically controlled oscillator (NCO) IC from
Harris (HSP45102) with a PIC.  You simply download the divisor to the IC
via its SPI interface.  It actually outputs a 12 bit sine wave but I only
used the most significant bit to get a square wave.

I don't think that a PIC alone would be sufficient.  You could also use a
PLL frequency synthesizer.  The problem is that 1Hz-10KHz spans 4 decades
which would make the oscillator design tricky.

Niki