I can't find any info in the data sheets about the behaviour of the
internal oscillator of the 18F1320 with respect to temperature.

I'm using the internal osc at 4 mHz for a project, and it appears to be
reasonably accurate - about 0.2 percent at room temperature. The project
involves resetting some counters and computing some averages at midnight
(more or less). My time-of-day clock code can easily be calibrated to
compensate for the error, but I've no idea how the osc freq will change
with temperature. The environment will vary from perhaps 5 degrees Celsius
to 35 degrees Celsius. If the freq doesn't change by too much, I can get
away with using the internal osc, as I don't really need to be too close to
midnight - I can reset the clock manually every few days if necessary.

Does anyone have any ideas as to the oscillator's behavior in this regard?

Larry Bradley
Orleans (Ottawa), Ontario, CANADA

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