GTP_CLCK_OFF
bus_space_write_1(iot, ioh, off, GTP_WREN_ON | GTP_CLCK_OFF | data);
bus_space_write_1(iot, ioh, off, GTP_WREN_ON | GTP_CLCK_OFF | data);
bus_space_write_1(iot, ioh, off, GTP_WREN_ON | GTP_DATA_ON | GTP_CLCK_OFF);
GTP_DATA_ON | GTP_WREN_OFF | GTP_CLCK_OFF);
#define GTP_READ_CLOCK_LOW (GTP_WREN_OFF | GTP_DATA_ON | GTP_CLCK_OFF)