National Instruments Low-Cost Multifunction I/O Board for ISA..., User Manual

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Appendix D Register Map and Descriptions
© National Instruments Corporation D-15 Lab-PC+ User Manual
Analog Input Register Group
The four registers making up the Analog Input Register Group control the analog input circuitry
and can be used to read the FIFO. Reading the FIFO Register returns stored A/D conversion
results. Writing to the Start Convert Register initiates an A/D conversion. Writing to the A/D
Clear Register clears the data acquisition circuitry. Writing to the DMATC Clear Register clears
the interrupt request generated by a DMA terminal count pulse.
Bit descriptions for the registers making up the Analog Input Register Group are given on the
following pages.