Circuit Simulation Problem

[gdilek]

Dear experts,

I am trying to simulate a circuit using Multisim 12.

I have grounded possible places. Do I also need to ground the at89s52 pins? 

I would really appreciate if you could take a look at the circuit provided and let me know the problems that need fixing.

Thank you

[Miguel_V]

Hello,

Time step simulation error? Head to Simulate » interactive simulation settings » Analysis options » Customize... And in there try changing the shunt resistance to e-8. That should work.

Kind regards,