GTP_CLCK_ON
bus_space_write_1(iot, ioh, off, GTP_WREN_ON | GTP_CLCK_ON | data);
GTP_DATA_ON | GTP_WREN_OFF | GTP_CLCK_ON);
#define GTP_READ_CLOCK_HIGH (GTP_WREN_OFF | GTP_DATA_ON | GTP_CLCK_ON)