How do I know if a PIC is dead ?

[skimask]

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.

I would think that what you did wouldn't kill the PIC...and if it did hurt it, it's probably just that particular pin/port.

In my experience, killing an entire PIC is fairly hard, especially the 16F series. I think I've killed one PIC in the last XX years, probably due to this lightning strike that went from my finger tips to the PICs pins after walking across a carpet.