In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Beau Schwabe wrote:

Thanks Tracy,

I have seen this, and actually have implemented it, but it eats up allot of CPU cycles.

"What frequency range are you looking at?"
To start off, I would be happy with DC to a few MHz (5? 10?)... Once you get to 10MHz
or so, a square wave starts looking like a sine, and I could just go up from there.

I'm still not sure what step increment I want though.  I have an idea for a wide range
VCO that could drive the OSC pin of an SX for the lower frequencies.

I will look into the AD9850 as an option.

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