[sdiy] digital clock schematic

[tuj at fuse.net]

I'm looking for a schematic for a square-wave osc (TTL or similar) that can be locked to various frequencies.  I want something were I can input the desired frequency as a binary number and have the osc produce it to within 1 Hz.  Range needs to ideally be 1KHz to about 2MHz.

I was thinking the way to do this would be to use a crystal osc at say 10MHz, then compute 10MHz/desired frequency to get the ratio, and use a counter to count the oscillations, resetting when it matches the ratio number. 

Am I on the right track?  Better ways to do this?  Thanks.
-tuj