The DIN and DOUT were combined with serial port line P62 and P63 in M16C/62; and the P23 in M16C/62 was used to link with TXEN to control the data receiving and sending.

• DIN、DOUT与M16C/62的串口线P62、P63连接,并用M16C/62的P23连接TXEN,以便控制数据的接收或是发送。