18f458 vs 18f4525

[peter]

i need help !!
all my progs work fine with the pic18f458 ie sd filesystem
but .. the pic18f4525 then same progs will not work ??
i know it is very global ....
i read the manual oftn and often i found no big diffs between these prozessors ??
help help help

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[cgriffin]

I remember the 4520 had changes required when upgrading old 452 code. The newer devices had extra peripherals that the old ones didn't, and they were defaulted to a condition that didn't exist in the old one... meaning new register settings had to be made to get old code to work.

Moral of the story: set every register value manually, and do not count on the defaults. You may need to read up on what every single sfr does.