INT2_TIMER_2
bus_space_write_1(iot, ioh, INT2_TIMER_2, (sampletime & 0xff));
bus_space_write_1(iot, ioh, INT2_TIMER_2, (sampletime >> 8));
(void)bus_space_read_1(iot, ioh, INT2_TIMER_2);
msb = bus_space_read_1(iot, ioh, INT2_TIMER_2) & 0xff;
timer_2 = INT2_TIMER_2;