Hi, Kklim
could you " twist" somewhat the OSCTUNE register of the 683 ??? ... just to get a precise match with the '84 oscillator frequency ...
may be just use the " blinky led " program and trim the 683 osc frequency to that you've measured on the '84 ...
internal osc is " not so good " if you need frequ. matching ...
Alain
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Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
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IF there is the word "Problem" in your question ...
certainly the answer is " RTFM " or " RTFDataSheet " !!!
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