User`s manual

112 Agilent E1330B Digital I/O Module Register Information
Appendix B
Port Interrupt
Control Register
The Port Interrupt Control Register is a read/write register and functions as
the interrupt register for the port. This register shows the interrupt enable
status, the level of interrupt that can signal the controller (always set to 0),
and whether an interrupt is pending.
Bits (0-3) Are unused.
IL0 and IL1 (Interrupt Level) Both bits must be left at 0 to initialize the Digital I/O module for interrupt
operation.
IP (Interrupt Pending) When equal to "1", indicates an interrupt is pending. This is a read/write bit.
You can force a hardware interrupt by setting this bit to "1" if PIEN is set to
"1" and IEN is set to "1" in the Status/Control Register.
PIEN (Port Interrupt Enable) When set to "1", enables interrupt. Pending or forced interrupts are ignored
if set to "0".
Port Address (0–3) base+08
16
, base+09
16
, base+0A
16
, base+0B
16
76543210
PIENIPIL1IL0————
Figure B-3. Interrupt Line Logic Diagram