the topic discussed on this thread deals wit ha specific problem of migration to the P version of Mega AVRs.https://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=86347&start=0&postdays=0&postorder=asc&highlight=&sid=a6921e3541563d4c41d512fd6af7d70f
I don't seem to be able to program my M88PAs more than once. I am using a 20MHz ceramic resonator - so the fuses are checked appropriately.
After the first program, I can rewrite the fuses, but they always return 0xFF, 0xFF and 0xFF. The Same applies to reading the signature.
Using HV Parallel programming on my SKT500 (inc BSEL2 to PC2 and PJUMP fitted) doesn't seem to restore the chips.
Any suggestions? What is wrong?