AVR-Chat

Most of the ATtinys that that have debugging have DebugWire which uses  
the reset pin, only. Check the processor you are interested in for  
DebugWire. If it does not have it, then no debugging on that chip.

You might need a way to isolate the other lines during operation if  
you need to actively use one of those lines. I seem to recall folks  
using a series resistor between the programming connector and the  
micro, in that case.

Jim

On Sep 2, 2010, at 8:48 PM, Philippe Habib wrote:

> I'm considering an ATTiny part but I'm not totally clear on the
> programming and if source level debug is supported. My reason for the
> ATTiny is the physical size I can have is very constrained.
>
> The programming data line is also the I2C data line. Does that mean
> no I2C if I want in circuit programming?
>
> Is source level debugging possible on the part?
>
> I'm guessing that I can't have source level debug and I2C at the same
> time since they share a pin.
>
> 



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