Hi all,

I have an application that runs with 89c51 of Atmel.

Just now when we changed the lot of micro supply, the application stopped working.

The application starts working from external -1 interrupt.

Initially we assumed perhaps the software has gone corrupt, or the hardware has gone wrong or this or that .... and nothing worked.

Finally we accidently discovered that after the interrupt actuation if a finger is placed on the micro plastic (without touching a pin or any metal part) then the interrupt is accepted and it starts working.

However the other ext-0 int. is working ok.

We tried several micro from the new lot.

The old lot doesn't give any problem

What it can be

Simon