Chapter 5
Register Map and Description
©
National Instruments Corporation
5-9
PCI-DIO-96 User Manual
Interrupt Control Register 2
Address:
Base a 15 (hex)
Type:
Write-only
Word Size:
8-bit
Bit Map:
Bit
Name
Description
7–3
X
Don’t care bit.
2
INTEN
Interrupt Enable Bit—If this bit is set, the
PCI-DIO-96 can interrupt the computer. If this bit is
cleared, the PCI-DIO-96 cannot generate interrupts
to the computer, regardless of the status of the bits in
Interrupt Control Register 2.
1
CTRIRQ
Counter Interrupt Enable Bit—If this bit is set, the
82C53 counter outputs can interrupt the computer. If
this bit is cleared, the counter outputs have no effect.
0
CTR1
Counter Select Bit—If this bit is set, the output from
counter 1 of the 82C53 is connected to the interrupt
request circuitry. In this mode, counter 0 of the
82C53 acts as a frequency scaler for counter 1,
which generates the interrupt. If CTR1 is cleared, the
output from counter 0 of the 82C53 is connected to
the interrupt request circuitry. In this mode,
counter 0 generates the interrupt. For more
information, see the section Interrupt Programming
Example for the 82C53 in Chapter 6, Programming.
7
6
5
4
3
2
1
0
X
X
X
X
X
INTEN
CTRIRQ
CTR1
