Re: ATMEL AVR chip suppliers

From: Marko Mäkelä (
Date: 2006-03-08 11:44:09

On Wed, Mar 08, 2006 at 02:31:16AM -0600, Jim Brain wrote:
> I prefer not to wire directly to my very expensive laptop parallel 
> port.  While it is possible, I would never recommend such a risky move 
> to someone, as if they fry their port, they'll come yelling for me. 

Right, it is better to be safe than sorry.

> So, a 74LS245, perfboard, DB25, 2 2x5 headers, 2 2x5 female ribbon cable 
> plugs, and a bit of 10 conductor ribbon cable looks to run ~ USD$5.00.  
> Still mighty cheap, in my opinion.

Yes.  My point was that if the device is going to have a computer interface,
one could arrange the interface in such a way that it can also used for
programming the microcontroller.  I did that in the C2N232 and in the
infrared-wakeup circuit I made for my digital TV receiver/recorder based
on VDR (  In the C2N232, the programming interface
is RS-232 bitbanging with RTS,CTS,TxD and RxD.  In the latter circuit, I use a
2x6 header that is compatible with the 2x5 header of the Atmel programming
cable (of the STK200 dongle).


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