Advantech MIC-3758DIO, Руководство пользователя

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MIC-3758DIO User Manual 22
Chapter 4 Operation
4.1 Interrupt Function
MIC-3758DIO provides an interrupt function for every digital input
channel. All the isolated digital input channels are connected to the inter-
rupt circuitry. You can disable/enable interrupt function, select trigger
type by setting the Rising Edge Interrupt Registers and Falling Edge
Interrupt Registers of the MIC-3758DIO. When the interrupt request sig-
nals occur, the software will service these interrupt requests by ISR. The
multiple interrupt sources provide the card with more capability and flex-
ibility.
4.1.1 IRQ Level
The IRQ level is set automatically by the CompactPCI Plug & Play BIOS
and is saved in the CompactPCI controller. There is no need to set the
IRQ level. Only one IRQ level is used by this card, although it has two or
four interrupt sources.
4.1.2 Interrupt Modes for Digital Input
There are four registers that control the function and status of each digital
input interrupt signal source. They give you the ability to select different
modes to match different applications. The four registers are: Interrupt
State Register, Rising Edge Interrupt Register, Falling Edge Interrupt
Register and Port Identify Register. The detailed functions of these regis-
ters are described in Appendix C.
Figure 4.1: Digital Input Interrupt Mode