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

In my opinion, the 1 Meg resistor is what you want (if you want to use any at all). The resistor is just insurance that the resonator will startup. 

You don't need to remove the resonator for programming, but you do for debugging.

Looking at the datasheet for the Parallax 4MHz resonator, it looks like they are +/- 0.5% and +/- 0.2% over temperature. So total stability would be +/- 0.7% ( 10 minutes per day, not good enough for a clock). For a clock go with a crystal (they are probably 50 or 100 PPM, 100PPM = 0.01% or 8.6 seconds per day).

Bean.

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