STICK_COUNT_MASK
sys_tickcmpr_set((t0 + cycles) & STICK_COUNT_MASK);
if (cycles <= ((sys_tick() - t0) & STICK_COUNT_MASK))
stickcmpr_set((t0 + cycles) & STICK_COUNT_MASK);
if (cycles <= ((stick() - t0) & STICK_COUNT_MASK))