BT848_E_CONTROL
btand(~BT848_CONTROL_COMP, BT848_E_CONTROL);
btand(~BT848_CONTROL_LDEC, BT848_E_CONTROL);
btor(BT848_CONTROL_LDEC, BT848_E_CONTROL);
btaor(hibit, ~4, BT848_E_CONTROL);
btaor(hibits, ~3, BT848_E_CONTROL);
btor(BT848_CONTROL_COMP, BT848_E_CONTROL);
btand(~BT848_CONTROL_COMP, BT848_E_CONTROL);