BT848_CONTROL_LDEC
btand(~BT848_CONTROL_LDEC, BT848_E_CONTROL);
btand(~BT848_CONTROL_LDEC, BT848_O_CONTROL);
btor(BT848_CONTROL_LDEC, BT848_E_CONTROL);
btor(BT848_CONTROL_LDEC, BT848_O_CONTROL);