Yes, this what I was speaking about...

ISP chips are very very very interresting in most of applications I'm thinking. But sometimes I would use some other chips for their special feature. But, I can't affort to put an external EPROM for the code, the system should have embedded flash for the purpose I've explained in previous posts.
Then if we have a uC with an external flash, a way to have a kind of IAP would allow to use these chips as if they were ISP.

The methods I've seen are :
- uC with bootvector in internal ROM programmed by the provider and external flash for the code. The issue is that it's not possible to update the bootvector
- external EPROM for bootvector and external flash for code... Too expensive...
- Bootvector in external flash, but how to programm it the first time ?

Well, do you see more precisely what I mean ?


Regards
Stephane