Anyone know how the accuracy of the internal oscillator on a 12F675H
varies with supply voltage? I only see initial accuracy listed in
the datasheet; if there is a spec for this i am not finding it.

The reason I am asking is this: I'm running the PIC off a 3V Li-Ion 
battery, using the same protocol as in their demo source code,
xmit_demo.asm. each transmitted bit has a period of 1.2msec. To
transmit a '1', the high-time is 400usec, low time 800usec. To
transmit a logic '0', the high-time is 8usec, low time is 400usec.
Timing is generated by the internal oscillator. So it would be
useful/vital to know the effect of a decaying battery voltage 
on the oscillator accuracy to figure out the tolerances the 
receiver has to deal with, give a low battery alarm, etc.



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