Atmel Programmer

Jan 25, 2004 5 Replies
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ok i built the above programmer using an at90s2312 also completed crystal circut......



anyhow long story short, i can read security descriptors, but anything else failes the led also never lights up, the par port is giving me 4.6 volts and



96ma but the power drastically drops when i run an action, vcc to the atmel only carries 2.1 volts or so ...

Any ideas? been over the circut 30 times it matches......


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Ok so i have 2.5 volts on vcc goint to my atmel, if i hit write/read it drops to 1mv or so, possibly there's not enough power coming out of the parallel port?

else

and

atmel

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L

Have you got the Vdd supply from the target board on pin 2 of the ST1 connector? It sounds as if you are trying to power the whole thing from the parallel port.

Leon

Leon Heller, G1HSM Email: aqzf13@dsl.pipex.com My low-cost Philips LPC210x ARM development system: http://www.geocities.com/leon_heller/lpc2104.html
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D

where are you getting your +5V from?

Don...

Don McKenzie E-Mail Contact Page: http://www.e-dotcom.com/ecp.php?un=Dontronics USB to RS232 Converter that works http://www.dontronics.com/usb_232.html Don's Free Guide To Spam Reduction http://www.e-dotcom.com/spam_exp.php
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D

Hi!

I think the programmer only works when your target board is powered!

Dirk
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All is now working, thats for helping out a greenie,... been about 10 years since i touch this kind of stuff...

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