> >I know the Picstart does multi-voltage verification, but I don't need
> >that in the AVR.

> (Fortunately for me, the hardware guys have their power supplies
> designed for a rock-solid 5 volts so I can get away with the Picstart
> for production use.)

You'd hope that any regulated supply is going to be better than +/-
10%.
The point of multi-voltage verify is not just to test that it will work
with supply variations. It is a test of how much headroom there is
available to reliably read the rom. Your supply may be perfect but
your application might use up that headroom over temperature and
get errors on hot days. The most common fault detected is non-
fatal ESD damage.

I verify all my parts at multi-voltage and the most common error is
failure to verify at high Vcc. Most times the same part will pass
after a reprogram but sometimes never comes right (but verifies at
5V). Of the parts that I do, Atmel 5V flash (29C010) parts seem to
give the most trouble (ie. need doing twice). Just about everything
else (PIC, AVR, 8x51, etc) seem to be about the same.

Steve.

======================================================
Steve Baldwin                Electronic Product Design
TLA Microsystems Ltd         Microcontroller Specialists
PO Box 15-680, New Lynn      http://www.tla.co.nz
Auckland, New Zealand        ph  +64 9 820-2221
email: steveb@tla.co.nz      fax +64 9 820-1929
======================================================

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