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Register-Level Programming 
Chapter 4
PC-DIO-96 User Manual
4-6
© National Instruments Corporation
Interrupt Control Register 1
D7
D6
D5
D4
D3
D2
D1
D0
DIRQ1
DIRQ0
CIRQ1
CIRQ0
BIRQ1
BIRQ0
AIRQ1
AIRQ0
Bit
Name
Description
7
DIRQ1
PPI D Interrupt Request for Port B—If this bit and the INTEN bit
in Interrupt Control Register 2 are both set, PPI D sends an
interrupt, INTRB, to the host computer.  If this bit is cleared, PPI D
does not send the interrupt INTRB to the host computer, regardless
of the setting of INTEN.
6
DIRQ0
PPI D Interrupt Request for Port A—If this bit and the INTEN bit
in Interrupt Control Register 2 are both set, PPI D sends an
interrupt, INTRA, to the host computer.  If this bit is cleared,
PPI D does not send the interrupt INTRA to the host computer,
regardless of the setting of INTEN.
5
CIRQ1
PPI C Interrupt Request for Port B—If this bit and the INTEN bit
in Interrupt Control Register 2 are both set, PPI C sends an
interrupt, INTRB, to the host computer.  If this bit is cleared, PPI C
does not send the interrupt INTRB to the host computer, regardless
of the setting of INTEN.
4
CIRQ0
PPI C Interrupt Request for Port A—If this bit and the INTEN bit
in Interrupt Control Register 2 are both set, PPI C sends an
interrupt, INTRA, to the host computer.  If this bit is cleared, PPI C
does not send the interrupt INTRA to the host computer, regardless
of the setting of INTEN.
3
BIRQ1
PPI B Interrupt Request for Port B—If this bit and the INTEN bit
in Interrupt Control Register 2 are both set, PPI B sends an
interrupt, INTRB, to the host computer.  If this bit is cleared, PPI B
does not send the interrupt INTRB to the host computer, regardless
of the setting of INTEN.
2
BIRQ0
PPI B Interrupt Request for Port A—If this bit and the INTEN bit
in Interrupt Control Register 2 are both set, PPI B sends an
interrupt, INTRA, to the host computer.  If this bit is cleared, PPI B
does not send the interrupt INTRA to the host computer, regardless
of the setting of INTEN.