can someone tell me what arm chip is pin compatible with my AT80C2051.
The AT89C2051 perhaps? www.atmel.com/.../doc0368.pdf
Pretty sure no ARM chip supports this pin out and voltage scheme, perhaps you can use an interposer?
perhaps you can use an interposer?
Or just do the right thing and actually re-design the old PCB. Pin compatibility among micro controllers, even from different manufacturers, was a nice thing while it lasted. Those days, however, are thoroughly over
Odds are if you do any thing remotely exotic the interposer would probably cost more than spinning a cheap new board. Pick the right chip for the solution and it could be significantly smaller.