I am looking for the ICP / In Circuit Programming algorithm for the P89LPC901 microcontroller. Not the IAP / In Application Programming algorithm. I see Flash Magic sells some devices for programming, however, I wish to design/build my own.
Yes - I see it's a bit old.
A quick web research revealed this specification. However, a broader web search did not reveal an official source of this document.
Unfortunately the protocol is too complex to fit in an actual answer here.