National Instruments PC-LPM-16/PnP - page 76

Appendix D Register-Level Programming

PC-LPM-16/PnP User Manual D-4



National Instruments Corporation

Command Register 1

Command Register 1 indicates the input channel to be read and the interrupt enable bits.

Address:

Base address + 00 (hex)

Type:

Write-only

Word Size:

8-bit

Bit Map:

Bit Name Description

7 SCANEN* Scan Enable Bit—This bit enables or disables

multichannel scanning during data acquisition. The

power-on value is 1. If this bit is cleared, analog

channels MA<3..0> through 0 are sampled

alternately. If this bit is set, a single analog channel

selected by MA<3..0> is sampled during the entire

data acquisition operation. In order to perform single-

channel sampling, the UP/DOWN bit in Command

Register 2 must be clear before setting SCANEN* to

1. To set up a scanning mode, two consecutive

writings of this register are necessary. First, write the

desired valve to the UP/DOWN bit in Command

Register 2 if the UP/DOWN bit is not currently set to

its proper value. Then write MA<3..0> with

SCANEN* set to load the scan counter. Then write

MA<3..0> with SCANEN* cleared to enable

scanning.

For example, if the UP/DOWN bit is 0 and MA<3..0>

is 0011 and SCANEN* is first set, then cleared, analog

input channels 3 through 0 are sampled alternately

during subsequent data conversions. If SCANEN* is

set and is not cleared (with MA<3..0> still set to

0011), only analog input channel 3 is sampled during

the subsequent data conversions.

See the

Programming Multiple A/D Conversions with

Channel Scanning

section later in this appendix for

more information.

76543210

SCANEN* CNTINTEN EXTINTEN FIFOINTEN MA3 MA2 MA1 MA0

a.Book : l.Appendix D Page 4 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