template<uint8 cycle_frequency>
class sSMPTimer {
public:
  uint8 target;
  uint8 stage1_ticks, stage2_ticks, stage3_ticks;
  bool enabled;

  void tick() {
    //stage 1 increment
    stage1_ticks++;
    if(stage1_ticks < cycle_frequency) return;

    stage1_ticks -= cycle_frequency;
    if(enabled == false) return;

    //stage 2 increment
    stage2_ticks++;

    if(stage2_ticks != target) return;

    //stage 3 increment
    stage2_ticks = 0;
    stage3_ticks++;
    stage3_ticks &= 15;
  }
};

  sSMPTimer<128> t0;
  sSMPTimer<128> t1;
  sSMPTimer< 16> t2;

  alwaysinline void add_clocks(unsigned clocks);
  alwaysinline void tick_timers();
  uint32 clocks_executed();