AVR-Chat

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

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).

-----Original Message-----
From: Paul Maddox [mailto:P.Maddox@signal.qinetiq.com]
Sent: Monday, December 13, 2004 1:35 AM
To: AVR-Chat@yahoogroups.com
Subject: Re: [AVR-Chat] /PEN pin on ATMEGA128



Dave,

> >do i just connect /PEN pin to 4K7 resistor and VCC???
> /Program ENable   Enables programming when low.
> Tying it high would maybe be a mistake, maybe not.

I disagree, unused pins should be taken high via a resistor.. you wouldn't
want that pin bouncing to a zero level whilst in circuit now would you?
So, *YES*, take it to VCC via a 4k7/10k resistor..

Paul






Yahoo! Groups Links