CLOCK_TICK_RATE
clocks = timer2_ticks * ((clocks_per_tick * TICKS_PER_SEC)/CLOCK_TICK_RATE);
waiton_timer2((nsecs * CLOCK_TICK_RATE)/1000000000);
#define LATCHES_PER_SEC ((CLOCK_TICK_RATE + (LATCH/2))/LATCH)
#define TICKS_PER_MS (CLOCK_TICK_RATE/1000)