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PCI-1737U/PCI-1739U User Manual 30

4.3.5 Interrupt Flag Bit

The "interrupt flag" bit is a flag indicating the status of an interrupt. It is a

readable and writable bit. Read the bit value to find the status of the inter-

rupt, write "1" to this bit to clear the interrupt. This bit must be cleared in

the ISR to service the next incoming interrupt.

Table 4.5: Interrupt flag bit values

F0 Interrupt status

Read 1 Interrupt exists

0 No interrupt

Write 1 Clear interrupt

0 Don’t care

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 46

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