AVR-Chat

One last tid-bit: the reset line has no protection diodes to V+  This is the
only pin without protection since it needs to be able to respond to +12v for
parallel programming mode.

For most situations this isn't a big deal, but most people simply run that
line out to their ISP header without any protection.  I never do any more
than put a 1-4k resister in line, but having a diode on the connector side
of the resister connected to V+ would guarantee a safe header.

-----Original Message-----
From: Paul Maddox

Larry,

> Check the schematic for the chip in the manual: they show an internal
> pull-up on that line. (fig 22, reset logic).

neat.

> Same for the reset line - you can leave it unconnected if you are using
the
> internal BOD.  This is true for all the modern AVR's (not so for the very
> first batch of classics).

thats where it came from, playing with the mega103, 8515 and a few other now
happy and distant memories.

Paul