Ah. I do need a decent development environment, so it's back to the SiLab, which is very reasonable.

One problem I do have with the SiLab is NVM. I need to maintain some variables (around 100B) during power down. The only option for this on the SiLabs is the EEROM appl memory, with a possible minimum 20k re-write life. That isn't enough.

The options are to keep count of writes and move onto another area after a certain count (though perhaps someone can tell me if the whole 512B page wears out, even if bits are not written to zeros?? - I'd have thought not). Or to add a FRAM (I use FRAMs a lot, but had hoped to avoid the extra overhead - also to save two pins that would be needed for I2C).

Dave