Chapter 7 Digital I/O©National Instruments Corporation7-7DAQ-STC Technical Reference Manual7.6 Programming InformationThis section presents programming information that is specific to digital I/O. For generalinformation about programming the DAQ-STC, see section 2.6, Programming Information.7.6.1 Windowed Mode Register Access ExampleThe DAQ-STC register access method is illustrated by the following C code example./* The following code toggles the DIO lines on the DAQ-STC *//* The AT-MIO E Series boards address mapping of the DAQ-STC is used *//* to illustrate the addressing and access methods for the DAQ-STC */#define Board_Base_Addr 0x280#define DAQ_STC_Base_Addr 0x00 + Board_Base_Addr/* DAQ_STC base address *//* on the AT-MIO-E Series */#define DAQ_STC_Window_Address_Reg DAQ_STC_Base_Addr + 0x00#define DAQ_STC_Window_Data_Write_Reg DAQ_STC_Base_Addr + 0x01*2#define DAQ_STC_Window_Data_Read_Reg DAQ_STC_Base_Addr + 0x01*2#define DAQ_STC_DIO_Output_Register 0x0A#define DAQ_STC_DIO_Control_Register 0x0B#define DAQ_STC_DIO_All_Outputs 0xFFEXTSTROBE*/SDCLK O9TU External Strobe/Serial Data Clock—This active low outputsignal can serve as the clock signal with either the parallel orserial data or serve as a general digital output. It is intendedto be used in two modes: software-controlled mode orhardware-controlled serial clock mode. In thesoftware-controlled mode, this bit is toggled undersoftware-control. In the hardware-controlled serial clockmode, this pin serves as the clock signal associated with theserial data I/O pins. Parallel data output on DIO lines is usedwith the AMUX-64T. Serial data I/O is used with SCXI.Related bitfields: DIO_HW_Serial_Enable,DIO_HW_Serial_Timebase,DIO_Software_Serial_Control.STATUS<0..3> ID Status<0..3>—These pins serve as a board status register.Related bitfields: AI_Generic_Status.Table 7-1. Pin Interface (Continued)Pin Name Type Description
