The best way is to have 1MHz crystal , 2 pcs. of 22 pf capacitor and a simple gate IC. This way you can have a perfect 1MHz oscillator.
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Look at a simple RC oscillator.
can you explain to me how it work please.....? i dont understand about it....by the way, thanks for your reply....
Just Google it. http://www.maxim-ic.com/app-notes/index.mvp/id/2154