AVR-Chat

Hi John,
        So you see that this circuit may be hard to be
realized or you have another one ? - Actually i feel
confused about the serial progrmming process itself
... the data sheet even didn't mention wheather you
have to use a level shifter or not  ...
                              Ahmad El-Saied


 --- John Samperi <samperi@ampertronics.com.au> wrote:


---------------------------------
At 03:26 AM 5/03/2005, you wrote:

>was a problem that the connections aren't clear on
the schematic ...
>like the pins CTS, Rx, Tx & RTS/DTR ...


It is rather unclear. The Rx and Tx pins from the
level
shifter chip (Max232) go to the Rx and Tx pins of the
8535.
The RTS ans CTS pins (Hardware handshaking) can just
be
shorted together. For J1 chose the RTS setting. This
should
keep the PC happy and it should work. If you are going
to
the trouble of buiding this programmer on Veroboard
then I
would suggest again to use a similar programmer that
uses
the 2313 because I do some (free) firmware upgrade
from time to
time, even though the firmware should be reassemblable
(?  :-))
for the 8535. Vasilis Serasidis has lots of info on
his website
at www.serasids.gr




Regards

John Samperi

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