I am trying to understand what would happen to the program counter
under the following conditions when an interupt occurs.

As I understand, when an interupt occurs, the current instruction is
executed then the Address of the next instruction is placed onto the
stack so that normal program flow can continue after the IRQ has
been serviced.

What if the current instruction is  'ADDWF PCL', as in a jump table.

The program counter word would now become

Hi Byte = Pclath<4:0>    Low Byte = PCL + W.

Does the interupt preserve this as it's return address, or does it
point to the next address as it normally would.

Regards

Tony


Just when I thought I knew it all,
I learned that I didn't.