Timer 0 Example Program
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This example program shows how to configure timer/counter 0 as a
16-bit timer.  An interrupt service routine (ISR) is invoked each
time the timer overflows (goes from 0xFFFF to 0x0000).  Inside
the ISR, a variable called overflow_count is incremented by one.

To test this program...

1. Start the debugger.
2. Set a breakpoint on the 'overflow_count++' line in the ISR.
3. Run the program.

Each time the interrupt routine is invoked, the debugger will stop
running the program.  Position the cursor over 'overflow_count' to
see its current value.