Periodic timer (64Hz) with ARM processor and (embedded) Linux
I would think a Watchdog timer would work in this situation. When the timer reaches 0 or it overflows (it depends on if it counts down or up) the processor will trigger an interrupt.  If you configure the timer properly it might be able to trigger at 64Hz but that depends on the pre- and postscalers. It looks like the ARM processor does have such capabilities.