AT90S1200A RCEN bit

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I recently got a batch of 1200As, and after I got them, I found out they were set from the factory to use the internal RC osciallator. I need these chips to clock externally. I fount that I need to set bit 0 in the RCEN fuse, but how do I do that? Is this byte a byte in the normal EEPROM? And if so, what is its hex address?

I have FbPrg16, Ponyprog 1.7, and a general purpose burner with an AVR adaptor. None of these have the option to toggle RCEN in a 1200A. The only one that comes close is FbPrg16, and it has that feature for the Atmel 2343s.

Thanks

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You can only toggle RCEN fuse by parallel programing, so you´ll need a parallel programer; like STK500 Satrter Kit.

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Yes, I know you can only access the fuse bits in parallel programming. But how do I go about this? Can someone advise me where I would get this kit? And is changing RCEN a directly settable option or do I have to edit the hex?

Thanks

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Try Larry Barello's fuse programmer. I haven't tried it myself, but it looks simple enough a solution, and the source is readily available to change the various fuses.
http://www.barello.net/AvrProjec...
Hope this helps.

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Hello Cfontel,

To answer your question: No, you do not have to change your .hex file in order to program a fuse. The fuses have their own addresses and are not part of the data memory. In the STK500, you must make some simple connection adjustments (described in the manual), change the value of a check box, and then all the greyed-out fuses are there for you to dispose of :)

Morten, AVR tech. support, Atmel FAE

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Hi Cfontel!

You can find a SIMPLE and CHEAP parallel programmer at this site:

http://kitsrus.com/upuc.html#k122

I am using this programmer and it's fantastic. No expensive extra's, no hard to understand manuals, and they are giving away the schematic and parts list for free. Just click the pdf icon!

Greets, Benadski

AVRblinken code completed very soon!

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Thanks a million guys--Arturo, Eseahm, Morton, and Ralph. I really appreciate you taking the time to help me. This has been a fly in the ointment for me for a week now. I have a thousand bucks worth of 1200As I couldn't use. I just ordered the Kitsrus programmer, and the data sheet on it says it has options to set and clear RCEN and SPIEN right in the program. Awesome!! I like the fact it only cost 30 bucks too. :) I should have the progger in 2 days, so I'll post and say how it went.

Thanks

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