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?
What, exactly, do you mean by "compatible" here??
The ARM and 8051 architectures are pretty much incompatible!
Do you mean:
* An ARM that can interface to an AT80C2051 ?
* An ARM that can replace an AT80C2051 ?
* or what??
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.
got the best answer. found a supplier more AT80C2051 at very good price. no redesign. no trouble. quick. simple.
Well done. But make sure it isn't an AT89C4051 or AT89C2051 with the 9 made to look like an 0. The AT80C2051 is very rare.
found a supplier more AT80C2051 at very good (sic) price
Maybe a good short-term answer - provided these are genuine, full-spec, new & unused parts.
But, in the long-term, you just postpone the problem.
And, if the provenance of these devices is in any way less than certain, your problems may be just about to begin...