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© National Instruments Corporation Index-11 Lab-NB User Manual
selecting posttrigger mode, 4-47
selecting pretrigger mode, 4-49
terminating multiple A/D conversion
DAQ operation using EXTTRIG, 4-46
pretrigger DAQ timing (figure), 2-19
pretrigger mode
controlled acquisition mode, 4-49
to 4-51
freerun acquisition mode, 4-51
terminating multiple A/D conversion
DAQ operation using EXTTRIG, 4-46
programmable gain amplifier, 3-4
programming. See register-level
programming.
pulse generation, 2-21
pulse-width measurement, 2-22
R
RD* signal
description (table), 2-13
mode 1 input timing, 2-14
mode 2 bidirectional timing, 2-16
register-level programming. See also
registers.
analog input circuitry, 4-36 to 4-38
A/D FIFO output binary modes, 4-38
bipolar input mode (two’s
complement coding)
(table), 4-38
unipolar input mode (straight
binary coding) (table), 4-38
clearing, 4-39
initiating A/D conversion, 4-37
interrupt programming, 4-52
programming sequence, 4-36 to 4-38
reading A/D conversion result, 4-37
to 4-38
selecting analog input channel and
gain, 4-37
analog output circuitry, 4-52 to 4-54
analog output voltage versus digital
code
bipolar mode, two’s complement
coding (table), 4-54
unipolar mode, straight binary
coding (table), 4-53
interrupt programming, 4-54 to 4-55
digital I/O circuitry, 4-55 to 4-65
82C55A modes of operation, 4-55
to 4-56
mode 0 basic I/O, 4-56
mode 1 bidirectional bus, 4-56
mode 1 strobed I/O, 4-56
single bit set/reset feature, 4-56
control-word format
with control-word flag set to 0
(figure), 4-57
with control-word flag set to 1
(figure), 4-57
interrupt programming, 4-65
mode 0
control words (table), 4-58
programming examples, 4-58
to 4-59
mode 1 strobed input
control words, 4-59 to 4-60
Port C pin assignments
(figure), 4-60
Port C status-word bit
definitions, 4-60
programming examples, 4-61
mode 1 strobed output
control words, 4-61
Port C pin assignments
(figure), 4-62
Port C status-word bit
definitions, 4-62
programming example, 4-63
mode 2 bidirectional bus
control words, 4-63
Port C pin assignments
(figure), 4-64
Port C status-word bit
definitions, 4-64
programming example, 4-65
register descriptions and
programming examples, 4-57
to 4-65
single bit set/reset control
words, 4-65
external timing considerations for
multiple A/D conversions, 4-45 to 4-
46
using EXTCONV* signal to
initiate, 4-46