Microsoft UNO-3074 Interrupt Function of the DI Signals, IRQ Level, Interrupt Control Register

2.5.3 Interrupt Function of the DI Signals

DI0 and DI1 can be used to generate hardware interrupts. Users can setup the configuration of them by programming the interrupt control register.

The channels are connected to the interrupt circuitry. Users can disable/ enable interrupt function, select trigger type or latch the port data by set- ting the Interrupt Control Register of the UNO-3074 (refer to section 2.5.5 below). When the interrupt request signals occur, then the software will service these interrupt requests by ISR (Interrupt Service Routine). The multiple interrupt sources provide the card with more capability and flexi- bility.

2.5.4 IRQ Level

The IRQ level is by default set by the system BIOS. IRQ 7 is reserved for DI interrupt and counter interrupt.

2.5.5 Interrupt Control Register

Table 2.5: Interrupt Control Register Bit Map
Base Address		7	6	5	4	3	2	1	0
202H	R/W	Interrupt Enable Control/Status Register
								DI1EN	DI0EN
203H	R/W	Interrupt Triggering Edge Control/Status Register
								DI1TE	DI0TE
207H	R/W	Interrupt Flag/Clear Register
								DI1F	DI0F

The Interrupt Control Register controls the function and status of each interrupt signal source. Table 2.5 shows the bit map of the Interrupt Con- trol Register. The register is readable/writeable register. While being writ- ten, it is used as a control register; and while being read, it is used as a sta- tus register.

DI0EN & DI1EN: DI0 & DI1 Interrupt disable/enable control bit

DI0TE & DI1TE: DI0 & DI1 Interrupt triggering edge control bit

DI0F & DI1F: DI0 & DI1 interrupt flag bit

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