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Lab-PC+ User Manual Index-6 © National Instruments Corporation
D
D<7..0> bits
A/D FIFO Register, D-17
Counter A0 Data Register, D-24
Counter A1 Data Register, D-25
Counter A2 Data Register, D-26
Counter B0 Data Register, D-29
Counter B1 Data Register, D-30
Counter B2 Data Register, D-31
DAC0 Low-Byte and DAC1 Low-Byte
Registers, D-22
Digital Control Register, D-37
Interval Counter Data Register, D-39
Port A Register, D-34
Port B Register, D-35
Port C Register, D-36
D<11..8> bits, D-22
D<15..8> bits, D-16, D-17
D<15..12> bits, D-22
DAC0 Low-Byte, DAC0 High-Byte Registers
analog output circuitry programming, E-20
description, D-22
DAC0 OUT signal
analog output circuitry programming, E-20
description (table), 3-3
DAC1 Low-Byte, DAC1 High-Byte Registers
analog output circuitry programming, E-20
description, D-22
DAC1 OUT signal
analog output circuitry programming, E-20
description (table), 3-3
data acquisition modes. See controlled
acquisition mode; freerun acquisition
mode.
data acquisition operation, E-5
data acquisition timing circuitry, 4-5 to 4-8
block diagram, 4-4
data acquisition rates, 4-7 to 4-8
analog input settling time versus gain
(table), 4-7
bipolar analog input signal range versus
gain (table), 4-8
maximum recommended rates (table), 4-8
unipolar analog input signal range versus
gain (table), 4-8
multiple-channel (scanned) data
acquisition, 4-6 to 4-7
single-channel data acquisition, 4-6
data acquisition timing connections
EXTCONV* signal timing (figure), 3-21
EXTUPDATE* signal timing
generating interrupts (figure), 3-24
updating DAC output (figure), 3-24
posttrigger timing (figure), 3-22
pretrigger timing (figure), 3-23
DATA signal
description, 3-17
Mode 1 input timing, 3-18
Mode 1 output timing, 3-19
Mode 2 bidirectional timing, 3-20
DAVAIL bit
A/D interrupt programming, E-19
description, D-8
programming analog input circuitry,
E-3 to E-4
DGND signal (table), 3-3
DIFF input (four channels)
configuration, 2-11 to 2-12
definition (table), 2-11
signal connection considerations
ground-referenced signal sources,
3-7 to 3-8
nonreferenced or floating signal sources,
3-8 to 3-9
recommended configurations (table), 3-6
differential nonlinearity
analog input, A-3
analog output, A-4
Digital Control Register, D-37
digital I/O circuitry
block diagram, 4-10
theory of operation, 4-10 to 4-11
digital I/O circuitry, programming,
E-23 to E-24
control-word format
control-word flag set to 0 (figure), E-24
control-word flag set to 1 (figure), E-24
interrupt programming, E-34
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