RTII_CLCK_OFF
bus_space_write_1(iot, ioh, off, RTII_WREN_ON | RTII_CLCK_OFF | data);
bus_space_write_1(iot, ioh, off, RTII_WREN_ON | RTII_CLCK_OFF | data);
#define RTII_READ_CLOCK_LOW (RTII_DATA_ON | RTII_CLCK_OFF | RTII_WREN_OFF)