On Mon, 2006-08-21 at 20:43 -0700, Harold Hallikainen wrote:
> >
> > Maybe it is a good idea to avoid these LF chips for 3.3V operation
> > since they are a bit troublesome for ICSP and debugging.
> >
> 
> What's the difference between an F and an LF? I kinda thought that an LF
> was the same as an F that passed low voltage testing.

Generally F and LF parts are the exact same dies. The only difference is
LF parts have been tested at a lower voltage and passed.

> Do we really need to isolate the Vdd supply from the rest of the circuit
> so it can be pulled up to 5V for ICSP?

If you're doing "normal" devel no, since "normal" devel never needs a
bulk erase.

I've worked with the 18LF2320 at 3.3V with the ICD2 with zero problems.

If you enable code protection OTOH you have to do a bulk erase, and for
that you'll need to be up near 5V.

TTYL

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