Lpc2000

> well, I missed those 400ms for sector erase - bad news for me.
> Then, may be I can use another way:
> - on power-up load user data to RAM (also duplicating in external
>   serial flash ?)

This would just require a modification to your CRT init code. 

> - erase user data sectors in on-chip flash. At this point time to
>   erase is not that critical
> - during operation update user data in RAM only
> - on power-down use VDD delay to store RAM user data array in on-chip
>   flash

This should be fine as long as your VDD delay is long enough.  One thing
that is not well documented by Phillips -yet- is the current consumption on
the LPC214x series running at different clock and peripheral speeds.

Joel