Impulse 3093 - Manual (Page 14)

© Sealevel Systems, Inc. - 12 - DIO-32B User Manual
Interrupt Control
When enabled, interrupts are generated on Port A bit D0.
IRQEN Interrupt enable 1 = enabled 0 = disabled ( 0 on power up )
IRC0
IRC1 Interrupt mode select, see table below
Interrupt mode select, see table below
Interrupt Mode Select Table
Interrupt source is Base+0 bit D0. When selecting the Interrupt Type, always disable
interrupts prior to changing or setting states. This will help prevent inadvertent or
unexpected interrupts from occurring.
IRC1 IRC0 Interrupt Type
0 0 Low Level
0 1 High Level
1 0 Falling Edge
1 1 Rising Edge
Warning: When using the High and Low Level interrupts, an interrupt occurs when
input D0 changes to either a High or Low state. This will cause the computer to
remain in an interrupt state until the input state changes.
Interrupt Read
Reading the Interrupt Status port (Base+5) clears any interrupt pending.
IRQST (D0) Interrupt Status 1 = interrupt pending, 0 = none