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Both the start trigger and the stop trigger can come from a software command or a
hardware signal. If a hardware signal is used, the start (for the start trigger) or the
stop (for the stop trigger) of the acquisition can also be delayed. Refer to the device
specifications for possible signal sources.
3.3.3
Digital Input Interrupt
Some of the digital input channels can generate a software interrupt (or event) to
notice the application about the state change of input signals. Interrupts can occur at
rising edge, falling edge, or both edges of the digital input signal for selected chan-
nels as shown in Figure 3.19, Figure 3.20, and Figure 3.21, respectively. The enable/
disable of interrupt generation and the edges for generation can be configured inde-
pendently for each channel. Refer to the device specifications for the digital input
interrupt supported channels.
3.3.4
Digital Input Pattern Match Interrupt
A software interrupt (or event) can be generated by detecting a specific pattern of a
digital input port (each port consists of 8 channels). Each channel in the port can be
enabled or disabled the detection independently. For example, if channels 0, 1, 2, 3,
6, and 7 of a digital input port is pattern match detect enabled, and the pattern is
"10xx0100" (channels 7 through 0, where x indicates a don't care bit), an interrupt will
be generated as shown in Figure 3.22.
Figure 3.22 Digital input pattern match interrupt for pattern "10xx0100".
PCI-1716_Series User Manual
Figure 3.19 Digital input interrupt at rising edges.
Figure 3.20 Digital input interrupt at falling edges.
Figure 3.21 Digital input interrupt at both edges.
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