Using w98; MPLAB 5.40.00
I need an accurate time period on a 12C509 and testing code on a JW device.
Made a note of the internal calibration value before erasing.
Using TMR0 and internal oscillator for timing - set the up the calibration
constant in the Calibration window in MPLAB.

Here is my problem....when I test on MPLAB simulator the timing period if
fine and correct for a time period of 1 second I get 999.94 mS. But when I
programme the JW device the actual timing period is out by 10%. Is this what
I should expect? Should I use delay timer rather than TMR0?

TIA for any replies.
z

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