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pulsing pins

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Mordred

Post subject: pulsing pins

Posted: Thu Sep 16, 2010 9:28 am

Citizen

Joined: Tue Aug 10, 2010 3:42 pm
Posts: 15

I am workin on a nano 18 to communicate via serial to an LCD when I hooked up the LCD I noticed characters being generated. So tracking this down I hooked up a scope. To my surprise there is a pulse being generated even though the Nano 18 had no code written to it.

This pulse is on every pin of the development board.

Even though its a low amplitude its a regular frequency.

Any idea where its being generated from and is there a workaround. The ground and VCC is stable so the source of this pulse is a mystery but its also interfering with the serial communications.

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Acidtech

Post subject: Re: pulsing pins

Posted: Fri Sep 17, 2010 9:44 am

Site Admin

Joined: Thu Mar 01, 2001 11:00 am
Posts: 903
Location: Temecula, CA

All processors are tested before shipping them. The test code sends a pulse to every pin aat regular intervals so we can see the I/Os are working(by driving LEDs). Once you reprogram the chip it will no longer have the test code on it.

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