can the beable board use an external clock

I have an application requires a very accurate time base. Can the beagle board use ane external time base for
interrupt counter?



No, yes, maybe. There is an external clock capability on the -xM. But as you have not said which one you have it is hard to know if you can use it or not. It is limited as to what you can do and it depends on what you want to do. Go to the processor TRM, again depeding on which board you have, and look a the SYS_ALTCLK input pin. You can also refer to the -xM schematic for where this pin connects.