Dear All Use Phytec167 Developmentboard core and Kail. according to the infineon app292201,just use INCAN16X.C DEFMO16X.C LDMOD16X.C SNDMO16X.C use P4.5 P4.6 to RX and TX , it does not work , No output in P4.6 can working only in Keil simulation mode. thanks a lot