Contec DIO-32DM3-PE, User Manual

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4. Function
46
DIO-32DM3-PE
Interrupt Control Function
The product can use up to four input signals as interrupt request signals at the time of using the general-
purpose I/O.
DIOA00 to DIOA03 can be used as interrupt request signals.
The product can generate an interrupt request signal to the PC when the input signal change from Low
to High.
Disabling/enabling Interrupts
Interrupt mask bits can be used to disable or enable the individual bits for interruptions.
Once a certain bit has been interrupt-disabled, no interrupt occurs even when the corresponding input
signal changes its level.
To let interrupts occur, enable the corresponding interrupt mask bit for interruptions.
All of the interrupt mask bits are interrupt-disabled when the power is turned on.
Clearing the Interrupt Status and Interrupt Signal
Interrupt status bits are used to identify the input signal bit being used for requesting an interrupt.
When an interrupt status is input, the interrupt request signal and the interrupt status are cleared
automatically.
- All of the interrupt status bits are set to 0 when the power is turned on.
- If an interrupt mask bit has been set to disable interrupts, the interrupt status bit is not set even
when the input signal changes its level.
CAUTION
CAUTION