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Re: [avr-gcc-list] PEN on atmega128

From: Kitts
Subject: Re: [avr-gcc-list] PEN on atmega128
Date: Sun, 5 Jun 2005 01:03:11 +0530
User-agent: KMail/1.8

On Sunday 05 Jun 2005 12:47 am IST, Jamie Morken wrote:
> Does PEN need to be tied to GND for the SPI
> programming interface to work on the atmega128?
> >From the datasheet:
> "PEN is a programming enable pin for the SPI
> Serial Programming mode. By holding this
> pin low during a Power-on Reset, the device
> will enter the SPI Serial Programming
> mode. PEN has no function during normal
> operation."

Well! I am not too sure about the PEN pin. The same confused me too. I 
think in certain situations it may be needed but i have not had the 
need for it. I have left the pin floating in my system's design and it 
all works fine.


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