Use xtal osc.
One byte is typically 10bits and that means a max drift of +/-5% if the last bit is to be detected correctly
(assuming sampeling in the middle of the bit).
The practical requirement is more like -/+1% for reliable operation. Only a xtal or maybe resonator
can achieve that type of accuracy.
kg4pid wrote:
--To make it work I had to change the the value that gets moved into
OSCCAL. Since the serial routine that I used had been around awhile
I can only assume that the problem is in the Pic oscilator. Don't
know what to do to fix it though as I don't want to have to
calibrate each pic chip.Max
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