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get in- and external software-debuggable

Thomas Meister

I want to modify my uc-board to make both internal and external memory software-debuggable. I thought of a von Neumann architecture but dont know how to design it correctly.

I planed to get the different modes switchable (monitor-program for downloading, Run external and Run internal). All of these modes can be selected by !PSEN and !EA signals.

           !PSEN   !EA
monitor =    0      1
run ext =    1      0
run int =    1      1


I do now just wonder what will happen when im setting both !PSEN and
!EA to 0...

Maybe someone of you can help me out.


thanks in advance

-Thomas