HB_SPEED_UP
CHANGE_REFRESH_COUNT(HB_SPEED_UP, cur_divisor, new_divisor);
CHANGE_REFRESH_COUNT(HB_SPEED_UP, cur_divisor, HB_HALF_DIV);
CHANGE_REFRESH_COUNT(HB_SPEED_UP, HB_HALF_DIV, new_divisor);
CHANGE_REFRESH_COUNT(HB_SPEED_UP, cur_divisor, new_divisor);