User manual

21 Chapter 2
2.5.7 Interrupt Triggering Edge Control
The interrupt can be triggered by a rising edge or a falling edge of the
interrupt signal, as
determined by the value in the interrupt triggering edge
control
bit in the interrupt control register, as shown in Table 2.7.
2.5.8 Interrupt Flag Bit
The interrupt flag bit is a flag indicating the status of an interrupt. It is a
readable/writable bit. To find the status of the interrupt, you
have to read
the bit
value. To clear the interrupt, you have to write “1” to this bit. This
bit must first be cleared to
service the next coming interrupt.
Note: UNO-3072Lprovides built-in examples to show how to deliver
digital input functionality. Refer to console mode examples in C:\Pro-
gram Files\Advantech\UNO\UNO_IsaDIO\Examples\Console. (Please
install DI/O driver from the UNO CD to use these examples)
Table 2.7: Interrupt Triggering Edge Control Bit Values
DI0TE & DI1TE Triggering edge of interrupt signal
0 Falling edge trigger
1 Rising edge trigger
Table 2.8: Interrupt Flag Bit Values
DI0F & DI1F Interrupt Status
Read 0 No interrupt
1 Interrupt occur
Write 0 Don’t care
1 Clear interrupt