MSP430FR5959: sequence conversion with adc triggered by timer

Part Number: MSP430FR5959

Hello, I would like to interrogate A0 to A2. The conversion should be started by a timer. I have used the following initialization:

  ADC12CTL0 = ADC12SHT0_0 | ADC12ON;// | ADC12MSC;
  ADC12CTL1 = ADC12SHS_1 | ADC12CONSEQ_1;
  ADC12CTL2 |= ADC12RES_2;
  ADC12IER0 |= ADC12IE2;
  ADC12MCTL0 |= ADC12INCH_0 | ADC12VRSEL_0;
  ADC12MCTL1 |= ADC12INCH_1 | ADC12VRSEL_0;
  ADC12MCTL2 |= ADC12INCH_2 | ADC12VRSEL_0 | ADC12EOS;
  ADC12CTL0 |= ADC12ENC | ADC12SC;         // Sampling and conversion start

  TA0CCR0 = 2048-1;                         // PWM Period
  TA0CCTL1 = OUTMOD_3;                      // TACCR1 set/reset
  TA0CCR1 = 2047;                           // TACCR1 PWM Duty Cycle
  TA0CTL = TASSEL__ACLK | MC__UP;           // ACLK, up mode
  __bis_SR_register(LPM3_bits + GIE);      // LPM0, ADC10_ISR will force exit

But unfortunately only the first conversion is performed. If you clear the interrupt flags in the interrupt routine of the ADC. If this is not done, the ADC converts constantly without retriggering by the timer. Can someone help there?

Best regards