NISTC_INTB_ENA_AO_ERR
NISTC_INTB_ENA_AO_ERR, 0);
NISTC_INTB_ENA_AO_FIFO | NISTC_INTB_ENA_AO_ERR, 0);
interrupt_b_bits = NISTC_INTB_ENA_AO_ERR;