PEX/PIO/PISO-DA Series Card
Analog Output Boards
User Manual/ Ver. 3.1/ Oct. 2013/ PMH-0010-31/ Page: 15
2.3.1 Interrupt Block Diagram
INT\
Level_trigger
INT_CHAN_0
INT_CHAN_1
initial_low
active_high
(to PEX/PCI slot)
The interrupt output signal of PEX-DA and PIO/PISO-DAxU series cards,
INT\, is set to
Level-Trigger and Active_Low.
If INT\ generates a low_pulse, the PIO-DA4/8/16 will
interrupt the PC once each time. If INT\ is fixed at low_level, the PEX-DA and
PIO/PISO-DAxU series
will interrupt the PC continuously. So for
the signal pulse_type for
INT_CHAN_0/1 must be controlled and must be fixed at a low_level state
normally and a high_pulse generated to interrupt the PC.
The priority of INT_CHAN_0/1 is the same. If both of these signals are active at the same
time, then INT\ will only be active once at a time. So the interrupt service routine has to read
the status of both interrupt channels to per form a multiple-channel interrupt. Refer to
for more information.
DEMO5.C
for INT_CHAN_0 & INT_CHAN_1
If only one interrupt source is used, the interrupt service routine doesn’t have to read the
status of the interrupt source. The demo programs, DEMO3.C and DEMO4.C, are designed to
demons rate a single channel interrupt. See:
DEMO3.C
for INT_CHAN_1 only (initial high)
DEMO4.C
for INT_CHAN_1 only (initial low)
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