Chapter 8 Interrupt Control©National Instruments Corporation8-3DAQ-STC Technical Reference Manual8.4 Programming InformationThis section presents programming information that is specific to the ICM. For generalinformation about programming the DAQ-STC, see section 2.6, Programming Information.8.4.1 Programming the Interrupt InterfaceThis section contains detailed programming information for users who need to do bit-levelprogramming of the interrupt interface for specialized applications.The DAQ-STC can be used as an interrupt management device. The DAQ-STC can generateinterrupts on up to 18 internal conditions and can propagate two externally generatedinterrupts. Ten pins are provided for the interrupt interface: pins IRQ_OUT<0..7> can be usedfor interrupt assertion, and pins IRQ_IN<0..1> can be used for interrupt propagation.Interrupts on the DAQ-STC are divided into groups A and B. Details are provided in section8.4.2, Interrupt Handling.8.4.1.1 Interrupt Output PolarityUse the following function to select the logic level that will indicate an interrupt condition onthe IRQ_OUT pins and to indicate whether you want the selected interrupt to be duplicatedon the IRQ_OUT<0..1> pins.Function MSC_IRQ_Personality{Interrupt_Output_Polarity = 0 (for active high) or 1 (for active low);Interrupt_Output_On_3_Pins = 0 (disabled) or 1 (enabled);}8.4.1.2 Interrupt Output Select and EnableUse the following function to select the IRQ_OUT pin that will indicate an interrupt conditionin the interrupt group and to enable interrupts for the group.Function MSC_IRQ_Configure{switch (interrupt group){case A:Interrupt_A_Output_Select = 0 through 7 (IRQ_OUT<0..7>);Interrupt_A_Enable = 0 (disabled) or 1 (enabled);break;case B:Interrupt_B_Output_Select = 0 through 7 (IRQ_OUT<0..7>);
