PIC18 Usart Low Priority Interrupt C

  // An die Usart- Schnittstelle das Schreiben aktivieren

  PIE1bits.TXIE = 1;  

  // Interrupt Prioritaet setzen koennen

  RCONbits.IPEN = 1;  

  // Prioritaet setzen

  IPR1bits.TXIP = 0;

  // Global Interrupt Enable High and Low. Enable external Interrupt int0

  INTCON = 0b11010000;

  //Interruptflag auf 0 setzen

  PIR1bits.TXIF = 0;

  TXREG1 = 0;

  TXSTA              = 0x2E;  

  RCSTA              = 0x90;

  BAUDCON            = 0x58;  // BRG16 = 1

  if(PIR1bits.TXIF){

    INTCONbits.INT0IE = 0;

    sprintf(text, "TASTER = %d", TASTER);

    putUsart(text);

    if(INTCON2bits.INTEDG0){

      INTCON2bits.INTEDG0 = 0;

    }

    else{

      INTCON2bits.INTEDG0 = 1;

    }

    INTCONbits.INT0IF = 0;

    INTCONbits.INT0IE = 1;

    PIR1bits.TXIF = 0;

  }