How do I know if a PIC is dead ?

[rngd]

Hi,

How do you guys test to see if a PIC is burnt ? Im using a PIC16F877A with the WinPic800 programmer. The programmer can detect, read and write onto the PIC as usual.

The reason I ask this is because I accidentally connected around 8-10V into the Vref pin of port A, and Im worried that I might have fried it. It was only for a very short while though, like for one second..

Also, will only certain ports be dead, or will the whole PIC be dead ?

Thanks everyone.