if (SB0_SCON0_RB8)
    { // node address byte
      if (I4Cchar == !GCnodeNumber) // who, me ??
      { // node address, continue
        return;
      }
      SB0_SCON0_SM2 = 0; // now receive data
      return;
    }
    else
    { // read data byte