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Index – National Instruments Low-Cost Multifunction I/O Board for ISA Lab-PC+ User Manual

Page 197

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© National Instruments Corporation

Index-1

Lab-PC+ User Manual

Index

Numbers

2SDAC0 bit, D-9
2SDAC1 bit, D-9
+5 V signal (table), 3-3
8253 Counter/Timer Register

Groups A and B, D-23 to D-32

Counter A Mode Register

description, D-27
interrupt programming for analog output

circuitry, E-22 to E-23

Counter A0 Data Register

controlled acquisition mode, E-6, E-7

posttrigger mode, E-13
pretrigger mode, E-15

description, D-24
freerun acquisition mode, 4-6, E-9
used as sample interval counter, E-9

Counter A1 Data Register

controlled acquisition mode, E-7

posttrigger mode, E-13
pretrigger mode, E-15

description, D-25
freerun acquisition mode, E-10
single-channel interval acquisition

mode, E-19

Counter A2 Data Register, D-26
Counter B Mode Register

description, D-32
multiple A/D conversions using interval

scanning, E-18

single-channel interval acquisition

mode, E-19

Counter B0 Data Register

description, D-29
programming

controlled acquisition mode, E-6
freerun acquisition mode, E-9

Counter B1 Data Register

description, D-30
multiple A/D conversions using interval

scanning, E-18

single-channel interval acquisition

mode, E-19

Counter B2 Data Register, D-31
overview, D-23

register map, D-2
Timer Interrupt Clear Register, D-28

8255A Digital I/O Register

Group, D-33 to D-37

Digital Control Register, D-37
overview, D-33
Port A Register, D-34
Port B Register, D-35
Port C Register, D-36
programming, E-23 to E-34

control-word format

control-word flag set to 0 (figure), E-24
control-word flag set to 1 (figure), E-24

Mode 0 operation, E-25 to E-26

control words, E-25 to E-26
programming examples, E-26

Mode 1 input, E-27 to E-28

control words, E-27
Port C pin assignments, E-28
Port C status-word bit definitions, E-28
programming example, E-29

Mode 1 output, E-29 to E-31

control words, E-29
Port C pin assignments, E-30
Port C status-word bit definitions, E-30
programming example, E-31

Mode 2 operation, E-31 to E-34

control words, E-31 to E-32
Port C pin assignments, E-33
Port C status-word bit definitions, E-32
programming example, E-33
single bit set/reset control words, E-33
single bit set/reset feature, E-34

register map (table), D-2

A

ACH<0..7> signal

description (table), 3-3
input ranges and maximum ratings, 3-4

ACK* signal

description, 3-16
Mode 1 output timing, 3-19
Mode 2 bidirectional timing, 3-20
Port C signal assignments (table), 3-16