Hi;
Michael Karas said that PNP type transistor can be used.
Yes, I know that solution. However, I don’t want to use Low-Active Design.

Assume that;
There is can be cold solder betwen 8051 I/O pin and transistor ‘s Base pin.
When I/O pin is logic-1. Due to cold solder, PNP transistor’s Base pin will be logic-0 and RELAY ACTIVE… (Who can warrant that such an event won’t happen.)

Low-Active design is not secure for that kind of circuits.

However, any other diffrent circuits can be designed. But, I don’t want to hardware based solution.

In other way, I can be passed up power-on port situation in data sheet. But this mean is not “ATMEL true”. I think ATMEL must have done selectable internal pull-up resistors.

If there is not software solution,
If ATMEL won’t do selectable internal pull-up resistors,
If ATMEL won’t solve that very easy problem,
What can I say ???