You really don't have to 'RELEARN' everything...because there really isn't anything to 'RELEARN'.
There is a document somewhere at Microchip that describes some basic differences between the '877 and the '452 that might help you out...
But...quite frankly, no code...not much help...'cause there just might be that one hidden thing that is stopping everything.
Have you made blinky LED work on the '452 yet?
And just because you've made it work on the '877 doesn't mean you can make it work on a '452....it should...but it doesn't.





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