F300_DATA
f300_set_line(dev, F300_DATA, 1);
f300_set_line(dev, F300_DATA, 1);
f300_set_line(dev, F300_DATA, (dta & 0x80) >> 7);/* msb first */
dta |= f300_get_line(dev, F300_DATA);/* msb first */
f300_set_line(dev, F300_DATA, 1);