PEX/PIO/PISO-DA Series Card
Analog Output Boards
User Manual/ Ver. 3.1/ Oct. 2013/ PMH-0010-31/ Page: 16
2.3.2 INT_CHAN_0/1
INT0/1
Inverted/Noninverted
select
(INV0/1)
Enable/Disable select
(EN0/1)
INT_CHAN_0/1
The architecture for INT_CHAN_0 and INT_CHAN_1 is shown in the above figure. The only
difference between INT0 and INT1 is that the INT_CHAN_0 signal source is from the 8254
counter0 output and the INT_CHAN_1 signal source is from the 8254 counter2 output.
INT_CHAN_0/1 must be fixed at a low level state normally and a high_pulse
generated to interrupt the PC.
EN0/1 can be used to enable/disable the INT_CHAN_0/1 in the following manner: (Refer to
EN0/1 = 0
INT_CHAN_0/1 = disabled
EN0/1 = 1
INT_CHAN_0/1 = enabled
INV0/1 can be used to invert/non-invert INT0/1 in the following manner: (Refer to
INV0/1 = 0
INT_CHAN_0/1 = inverted state for INT0/1
INV0/1 = 1
INT_CHAN_0/1 = non-inverted state for INT0/1
As noted above,
if INT\ is fixed at a low level state, the PEX-DA and
PIO/PISO-DAxU series
will interrupt the PC continuously, so the interrupt service
routine should use INV0/1 to invert/non-invert the INT0/1 in order to generate a
high_pulse
(Refer to the next section).
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