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National Instruments PC-LPM-16/PnP A/D Interrupt Programming, Programming the Digital I/O Circuitry

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Appendix D Register-Level Programming

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National Instruments Corporation D-35 PC-LPM-16/PnP User Manual

UP/DOWN bit in Command Register 2 is cleared—the software uses

the following scan sequence:

channel 3, channel 2, channel 1, channel 0, channel 3, channel 2,

channel 1, channel 0, channel 3, and so on.

Perform the following steps to select the analog input channel:

1. Program the UP/DOWN bit in Command Register 2 if the bit is not

already set to the desired value. Common Register 2 must always

be programmed before Command Register 1.

Note: The UP function is not yet supported by NI-DAQ. NI-DAQ will support the

UP function in a future release.

2. Write the configuration value indicating the highest channel

number in the scan sequence to Command Register 1. You must set

the SCANEN* bit during this first write to Command Register 1.

3. Write the same configuration value again to Command Register 1.

The SCANEN* bit, however, must be cleared during the second

write to Command Register 1.

Use either counter 0 or EXTCONV* to control the scanning interval.

A/D Interrupt Programming

You can use an interrupt to service the data acquisition operation. To

use the conversion interrupt, set the FIFOINTEN bit in Command

Register 1. If this bit is set, an interrupt is generated whenever the

DAVAIL bit in the Status Register is set. Clear this interrupt condition

by reading the FIFO, which empties its contents.

Programming the Digital I/O Circuitry

DIN0 through DIN7 (pins 22 through 29) of the I/O connector are

dedicated digital input lines. They are monitored by the Digital Input

Register. An 8-bit reading of the Digital Input Register returns the

current state of these digital input lines. DOUT0 through DOUT7

(pins 30 through 37) of the I/O connector are dedicated digital output

lines. These lines are always driven by the Digital Output Register. An

8-bit writing to the Digital Output Register drives the new digital value

to these lines. At startup, all of the digital output lines are initiated to

zero state.

a.Book : l.Appendix D Page 35 Wednesday, November 20, 1996 6:36 PM

Contents

Main Page Important Information WARNING REGARDING MEDICAL AND CLINICAL USE OF NATIONAL INSTRUMENTS PRODUCTS Trademarks Copyright Page Page Glossary Index Figures Tables About This Manual Organization of This Manual Conventions Used in This Manual National Instruments Documentation Related Documentation Customer Communication Introduction About the PC-LPM-16/PnP What You Need to Get Started LabVIEW and LabWindows/CVI Application Software Software Programming Choices NI-DAQ Driver Software Register-Level Programming Optional Equipment Custom Cables Unpacking Installation and Configuration Hardware Installation Software Installation Plug and Play Board Configuration Base I/O Address and Interrupt Selection Non-Plug and Play Theory of Operation Functional Overview Chapter 3 Theory of Operation Figure 3-1. PC-LPM-16PnP Block Diagram PC I/O Channel Interface Circuitry Analog Input and Data Acquisition Circuitry Analog Input Circuitry Data Acquisition Timing Circuitry Single-Channel Data Acquisition Data Acquisition Rates Multichannel Scanning Data Acquisition Chapter 3 Theory of Operation PC-LPM-16/PnP User Manual 3-8 Digital I/O Circuitry Digital I/O Circuitry Block Diagram Figure 3-4. Timing I/O Circuitry Page Signal Connections I/O Connector Chapter 4 Signal Connections Figure 4-1. PC-LPM-16PnP I/O Connector Pin Assignments Signal Connection Descriptions Page Analog Input Signal Connections Connections for Signal Sources Digital I/O Signal Connections Power Connections Power Rating Data Acquisition Timing Connections Timing Connections General-Purpose Timing Signal Connections and General-Purpose Counter Timing Signals Page Page Page Specifications A Transfer Characteristics PC-LPM-16PnP Board Amplifier Characteristics Digital I/O Stability Dynamic Characteristics Timing I/O Bus Interface Explanation of Analog Input Specifications Environment Physical Page Page B MSM82C53 Data Sheet Page Page Page Page Page Page Page Page Page Page Page Using Your PC-LPM-16 (Non-PnP) Board C the PC-LPM-16 Differences between the PC-LPM-16PnP and Page Page Configuration and Installation of the Board Configuration PC-LPM-16 (non-PnP) Page Base I/O Address Selection Page Page Interrupt Selection Analog Input Jumper Settings 5 V) Bipolar Input Selection 1 ( Bipolar Input Selection 2 ( Unipolar Input Selection 1 (0 to 10 V) Select the bipolar ( 2.5 V) 2.5 V) input configuration by setting jumpers W1 and W2 as shown in Figure C-6. Unipolar Input Selection 2 (0 to 5 V) Installation Register-Level Programming D Register Map Base Address Register Size Register Descriptions Register Description Format Configuration and Status Register Group Page Page Page Command Register 2 Command Register 2 Command Register 3 Status Register 1 Status Register 1 Page Status Register 2 Analog Input Register Group A/D FIFO Low-Byte Register and A/D FIFO High-Byte Register A/D FIFO Low-Byte Register and A/D FIFO High-Byte Register A/D Clear Register Counter/Timer (MSM82C53) Register Group Counter 0 Data Register Counter 1 Data Register Counter 2 Data Register Page Page Page Timer Interrupt Clear Register Digital I/O Register Group Digital Output Register Digital Input Register Programming Considerations Register Programming Considerations Initializing the PC-LPM-16/PnP Programming the A/D Calibration Programming the Analog Input Circuitry Analog Input Circuitry Programming Sequence A/D FIFO Output Binary Modes Clearing the Analog Input Circuitry Programming Multiple A/D Conversions on a Single Input Channel Using Counter 0 Page Page Programming Multiple A/D Conversions Using External Timing Programming Multiple A/D Conversions with Channel Scanning A/D Interrupt Programming Programming the Digital I/O Circuitry Programming the MSM82C53 Counter/Timer Customer Communication FTP Support Electronic Services E Bulletin Board Support Telephone and Fax Support Telephone Fax Fax-on-Demand Support E-Mail Support (currently U.S. only) Technical Support Form PC-LPM-16/PnP Hardware and Software Configuration Form Other Products National Instruments Products Documentation Comment Form Glossary Symbols A C B Page Page T V A Numbers Index B C D E I H F G J P N M O R S T U